Re: [time-nuts] Digital Clock kit - no Integrated circuits!
2010/1/10 Magnus Danielson mag...@rubidium.dyndns.org: Steve Rooke wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Bha! Mechanics, relays and transductors... tubes are so unreliable! Ah, you old fogies!!! :-) Cheers, Steve Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
I should have kept that pokie machine I made with three uniselectors, lamp arrays and a whole bunch of relays way back when I was 17, perhaps I could have made a fortune with it now. Cheers, Steve 2010/1/10 Bob Camp li...@cq.nu: Hi Maybe a system using a rotary electrical machine synchronous to the power line driving a system of gears. and pointers on a dial If the transistor clock is worth $200, I should be able to sell something like that for $400. Throw in the alarm buzzer feature and it could go for $600... Off to Walmart to stock up and make my fortune Bob On Jan 9, 2010, at 10:30 AM, Lux, Jim (337C) wrote: On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
I found quite a few on fleeBay. I remember back in high school using a counter with the readout composed of Dekatron tubes and I was fascinated as to how these could work. Steve 2010/1/10 J. Forster j...@quik.com: They were also called Dekatron, See the tubecollector site. I doubt they are still available any more. OTOH, there are plenty of things like 12AX7s out there, as long as you don't need the golden ear brands. -John === Only need one tube for a ring counter - the trochotron (q.v.). Just happen to have a military counter based on them, nixie display, Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Saturday, January 09, 2010 4:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! How about using ring counters? No decoder/drivers needed. A tube ring counter, driving a Nixie directly. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Steve Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In message 8256bb1c-7284-44f9-bba5-e2e8e014d...@gmail.com, Scott Burris write s: I have just the divide by 60 down to 1Hz done. It works now that I found that one diode I put in backwards. Is there any sign of a 50Hz option ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Poul, You can get 60Hz from this xtal circuit http://www.wiparat.com/60hz-clock-pulse-generator-by-ic-mm5369/ I don't know if the chip is still available, I remember building a few of them some 3 decades ago. My dad was impressed by the digital clock but kept commenting that his 25 year old Omega watch was more accurate. Cheers Raj @ 50 +- 2 Hz mains I have just the divide by 60 down to 1Hz done. It works now that I found that one diode I put in backwards. Is there any sign of a 50Hz option ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In message 4b48686a.9713f30a.4f7b.4...@mx.google.com, Raj writes: Poul, You can get 60Hz from this xtal circuit http://www.wiparat.com/60hz-clock-pulse-generator-by-ic-mm5369/ But that would really spoil an all-transistor clock, wouldn't it ? :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Steve Rooke wrote: Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Steve Being an Amurkan myself, by valves, I assume you are talking about a hydraulic clock. Yep. That's pretty old school. But we could step back to sundials or sand hour glasses. I guess the sundials would be the most accurate, but only during the daylight hours. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
2010/1/10 Rex r...@sonic.net: Steve Rooke wrote: Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Steve Being an Amurkan myself, by valves, I assume you are talking about a hydraulic clock. Yep. That's pretty old school. But we could step back to sundials or sand hour glasses. I guess the sundials would be the most accurate, but only during the daylight hours. Being British I think you call them tubes. Two nations divided by one language... Steve ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi Yes indeed. A lot of this was worked out a very long time ago. Most of what you see on the net these days is simply an IC circuit broken out into a bunch of discrete parts. IC's have different issues than discretes. Bob On Jan 8, 2010, at 10:46 PM, Bruce Griffiths wrote: At high temperatures the circuits with the additional diodes in series with the base will have problems with transistor leakage currents when all inputs are low. The person who created that page doesnt know how to design reliable circuits. A base to emitter shunt resistor is one way of avoiding this problem. Bruce Stanley Reynolds wrote: Knowledge of history doesn't = having lived it :-) http://www.play-hookey.com/digital/electronics/dtl_gates.html 3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page above indicates. Stanley - Original Message From: Bob Campli...@cq.nu To: Discussion of precise time and frequency measurementtime-nuts@febo.com Sent: Fri, January 8, 2010 8:10:34 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era Bob On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi It looks like it's a pretty simple circuit. A jumper across one of the flip flops in the divider ring counter should convert it from 60 Hz to 50 Hz pretty easily. Bob On Jan 9, 2010, at 4:26 AM, Poul-Henning Kamp wrote: In message 8256bb1c-7284-44f9-bba5-e2e8e014d...@gmail.com, Scott Burris write s: I have just the divide by 60 down to 1Hz done. It works now that I found that one diode I put in backwards. Is there any sign of a 50Hz option ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
On 1/9/10 5:01 AM, Rex r...@sonic.net wrote: Steve Rooke wrote: Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Steve Being an Amurkan myself, by valves, I assume you are talking about a hydraulic clock. Yep. That's pretty old school. But we could step back to sundials or sand hour glasses. I guess the sundials would be the most accurate, but only during the daylight hours. Clepsydra ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Steve Rooke wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Bha! Mechanics, relays and transductors... tubes are so unreliable! Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Poul-Henning Kamp wrote: In message 4b48686a.9713f30a.4f7b.4...@mx.google.com, Raj writes: Poul, You can get 60Hz from this xtal circuit http://www.wiparat.com/60hz-clock-pulse-generator-by-ic-mm5369/ But that would really spoil an all-transistor clock, wouldn't it ? :-) True. 50 Hz should not be too hard, if the dividers is aranged in /6 and /10 groups (as there is already 2 sets of that), modifying the /6 to /5 should be fairly trivial. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi Maybe a system using a rotary electrical machine synchronous to the power line driving a system of gears. and pointers on a dial If the transistor clock is worth $200, I should be able to sell something like that for $400. Throw in the alarm buzzer feature and it could go for $600... Off to Walmart to stock up and make my fortune Bob On Jan 9, 2010, at 10:30 AM, Lux, Jim (337C) wrote: On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
At 7:30 AM -0800 1/9/10, Lux, Jim (337C) wrote: I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. If they had used proper Nixies instead of those awful 7 segment LED displays, then they could have used the same circuit in the 5245 and gotten the job done with 8 transistors and 8 neon lamps and some CdS photoresistors per decade. My twin brother built a clock out of some old Beckman hollow-state counters... http://www.selectric.org/tubeclock/index.html -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi I *think* I still have a case of gas filled dual triodes sitting in the shed. The Beckman EPUT meter used them in the decade divider / display sections. I don't have any of the meters any more, but I do have the spare parts for them. Go figure They actually make pretty good low speed logic gates. Tube based clock driving neon bulbs for the display anybody? Bob On Jan 9, 2010, at 10:30 AM, Lux, Jim (337C) wrote: On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
I've actually got an EPUT with the prescaler good to 1GHz. Complete with manuals. Too many BA's, not enough time.. Bob Camp wrote: Hi I *think* I still have a case of gas filled dual triodes sitting in the shed. The Beckman EPUT meter used them in the decade divider / display sections. I don't have any of the meters any more, but I do have the spare parts for them. Go figure They actually make pretty good low speed logic gates. Tube based clock driving neon bulbs for the display anybody? Bob On Jan 9, 2010, at 10:30 AM, Lux, Jim (337C) wrote: On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
On Jan 9, 2010, at 1:26 AM, Poul-Henning Kamp wrote: In message 8256bb1c-7284-44f9-bba5-e2e8e014d...@gmail.com, Scott Burris write s: I have just the divide by 60 down to 1Hz done. It works now that I found that one diode I put in backwards. Is there any sign of a 50Hz option ? Yes, there's a mod here: http://transistorclock.com/50Hzmod.pdf Scott ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Steve wrote. Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Amen brother, but it would sure heat your house in the winter. Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com - Original Message - From: Steve Rooke sar10...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, January 09, 2010 2:09 AM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Steve Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Steve Rooke - ZL3TUV G8KVD A man with one clock knows what time it is; A man with two clocks is never quite sure. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.432 / Virus Database: 270.14.131/2609 - Release Date: 01/09/10 07:35:00 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Max Robinson wrote: Steve wrote. Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Amen brother, but it would sure heat your house in the winter. Sure thing, while we are having cold winter for a change (-14,0 C outside the kitchen window right now), the power-prices is high... Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In message 15f711f4-5f3d-4cb3-8745-34806a416...@cq.nu, Bob Camp writes: Hi Maybe a system using a rotary electrical machine synchronous to the power line driving a system of gears. and pointers on a dial That is what was known as a synchronous clock. Tom has one running off his atoms on his web-page... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In 1979 I went to the People's Republic of China with a delegation and a Data General Nova 1200 computer. In Shanghai, I was proudly shown a Chinese clone of the Nova, but the boards were huge (much bigger than the Nova's 15 x 15). The Chinese had taken all the MSI in the 'puter and broken it down to simple SSI ICs of Chinese manufacture and built a machine functionally identical with the Nova. In fact, they ran a DG diagnostic for me called NMORT, the multi-programming reliability test. They also had a hard disk about the size of a small washing machine. It was really quite impressive. The whole setup was in a room, maybe 30' square, with a polished wood floor and several techs in white coats. All in all, an interesting experience. Best, -John = Hi Yes indeed. A lot of this was worked out a very long time ago. Most of what you see on the net these days is simply an IC circuit broken out into a bunch of discrete parts. IC's have different issues than discretes. Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
How about using ring counters? No decoder/drivers needed. A tube ring counter, driving a Nixie directly. -John On 1/9/10 12:09 AM, Steve Rooke sar10...@gmail.com wrote: 2010/1/9 Tom Clifton kc0...@yahoo.com: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Bah humbug! Stupid modern day design, it'll never be any good, you need to use valves to make real gear :-) Well, they do make dual triodes which are convenient for making those Eccles-Jordan circuits. I can't help wondering if you go do better than the 4 bit counter:4-10 decoder:10-7 decoder. Yeah, simple diode matrices in an AOI configuration are easy, but surely a bit of work (as in digging up archaic designs) could find a lower part count approach. Time to use that Karnaugh map. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
HP made one with a sync motor running a Veeder Root counter. Something like a 115A. Runs off 100 KHz from their crystal oscillator. Neet unit. It does sing a bit. -John In message 15f711f4-5f3d-4cb3-8745-34806a416...@cq.nu, Bob Camp writes: Hi Maybe a system using a rotary electrical machine synchronous to the power line driving a system of gears. and pointers on a dial That is what was known as a synchronous clock. Tom has one running off his atoms on his web-page... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Only need one tube for a ring counter - the trochotron (q.v.). Just happen to have a military counter based on them, nixie display, Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Saturday, January 09, 2010 4:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! How about using ring counters? No decoder/drivers needed. A tube ring counter, driving a Nixie directly. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
As an undergraduate at a technical school, there were guys who were utterly hardware clueless in the dorms. The roomie of a friend was such a guy. Over winter vacation, I took his GE clock appart and flipped the magnet structure over so it would run backwards. He came back, dug out some EE books (he was a high honors student) and studied them for a while. Then he said Aha!, unplugged the clock from the wall and got a pair of scissors and some tape, and cut the line cord, swapped and spliced the wires, and plugged it back in. When it still ran backwards, he was very, very puzzled. Needless to say, my buddies and I who had watched this nearly died laughing. I swear this story is 100 % true. Maybe he had the last laugh though. He wound up running a huge agency in DC. -John == p...@phk.freebsd.dk said: That is what was known as a synchronous clock. Tom has one running off his atoms on his web-page... When I was a kid, I took apart my share of clocks and/or clock radios. They all had the same basic mechanism. It was a shaded pole motor with a semi sealed unit that included the first layer of gears. I never took apart one of the units. I assume the rotor had a permanent magnet so it would run synchronous to the line frequency. That was 50 years ago. -- These are my opinions, not necessarily my employer's. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
They were also called Dekatron, See the tubecollector site. I doubt they are still available any more. OTOH, there are plenty of things like 12AX7s out there, as long as you don't need the golden ear brands. -John === Only need one tube for a ring counter - the trochotron (q.v.). Just happen to have a military counter based on them, nixie display, Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Saturday, January 09, 2010 4:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! How about using ring counters? No decoder/drivers needed. A tube ring counter, driving a Nixie directly. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Well, I was talking about the original trochotron that required an external magnetic ring to form the switched beam. This tube did not function as an indicator, as the Dekatron does. Used a pair of Dekatrons to make an electronic Roulette wheel in the late '50s. Almost like watching the ball roll around. See http://en.wikipedia.org/wiki/Trochotron#History Bill Hawkins P.S. If you'd like to use twin triodes, I have a number of IBM 704 plug-in units with 8 sockets and 4 rows for parts. These can be saved from the dumpster by expressing an interest to b...@iaxs.net. The trochotron counter is also available, but shipping for 50 pounds may be expensive. -Original Message- From: J. Forster Sent: Saturday, January 09, 2010 5:15 PM They were also called Dekatron, See the tubecollector site. I doubt they are still available any more. OTOH, there are plenty of things like 12AX7s out there, as long as you don't need the golden ear brands. -John === Only need one tube for a ring counter - the trochotron (q.v.). Just happen to have a military counter based on them, nixie display, Bill Hawkins -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster Sent: Saturday, January 09, 2010 4:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! How about using ring counters? No decoder/drivers needed. A tube ring counter, driving a Nixie directly. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hp kinda stole the idea from the old General Radio syncro clock (I have two of these). In the longago time, we had a homemade version that generated 1 sec ticks to drive clocks in our research tower lab at New Mexico Tech. It ran for a number of years. Don Latham Chuck Harris Sing is an understatement! The motor is essentially a stepper motor that is being run with a 2 phase excitation. It is driven with 1000Hz, and whines pretty good... Fortunately it is in a thick aluminum case that is both air and water tight. It is considerably quieter if you make sure the ball bearings are in good shape. -Chuck Harris J. Forster wrote: HP made one with a sync motor running a Veeder Root counter. Something like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit. It does sing a bit. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Actually, the phonic wheel motor working at 1 kHz was used in the first ever crystal controlled clock made by W. A. Marrison of the Bell Telephone Laboratories in 1930. I too have a couple of the General Radio synchronometers, which I am restoring. John WA4WDL -- From: Don Latham d...@montana.com Sent: Saturday, January 09, 2010 7:29 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hp kinda stole the idea from the old General Radio syncro clock (I have two of these). In the longago time, we had a homemade version that generated 1 sec ticks to drive clocks in our research tower lab at New Mexico Tech. It ran for a number of years. Don Latham Chuck Harris Sing is an understatement! The motor is essentially a stepper motor that is being run with a 2 phase excitation. It is driven with 1000Hz, and whines pretty good... Fortunately it is in a thick aluminum case that is both air and water tight. It is considerably quieter if you make sure the ball bearings are in good shape. -Chuck Harris J. Forster wrote: HP made one with a sync motor running a Veeder Root counter. Something like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit. It does sing a bit. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hal. You may recall that the rotor had two discs which were friction linked but not hard linked. One of them looked like a gear with little teeth. The pole pieces also had teeth of the same pitch but they didn't touch. When power was applied the smooth disc got things started running like a shaded pole motor. As the rotor's teeth passed the stator's teeth the reluctance of the magnetic circuit was changed and the system wanted these changes to match the line frequency. Once the toothed rotor locked in the smooth one just went along for the ride as there was no longer any current being induced in it. That system was used until battery powered stepping motor clocks took over. Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com - Original Message - From: Hal Murray hmur...@megapathdsl.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, January 09, 2010 4:27 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! p...@phk.freebsd.dk said: That is what was known as a synchronous clock. Tom has one running off his atoms on his web-page... When I was a kid, I took apart my share of clocks and/or clock radios. They all had the same basic mechanism. It was a shaded pole motor with a semi sealed unit that included the first layer of gears. I never took apart one of the units. I assume the rotor had a permanent magnet so it would run synchronous to the line frequency. That was 50 years ago. -- These are my opinions, not necessarily my employer's. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.432 / Virus Database: 270.14.132/2610 - Release Date: 01/09/10 19:35:00 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
The GR system did the same thing. There's wasn't sound proofed and really made a whine. I had a NASA surplus one running in my office for about a week when someone in the department needed a stable 1ms time reference. It didn't take me long to build one with 7490s. Regards. Max. K 4 O D S. Email: m...@maxsmusicplace.com Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with transistors group send an email to. funwithtransistors-subscr...@yahoogroups.com To subscribe to the fun with tubes group send an email to, funwithtubes-subscr...@yahoogroups.com - Original Message - From: Chuck Harris cfhar...@erols.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Saturday, January 09, 2010 5:09 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Sing is an understatement! The motor is essentially a stepper motor that is being run with a 2 phase excitation. It is driven with 1000Hz, and whines pretty good... Fortunately it is in a thick aluminum case that is both air and water tight. It is considerably quieter if you make sure the ball bearings are in good shape. -Chuck Harris J. Forster wrote: HP made one with a sync motor running a Veeder Root counter. Something like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit. It does sing a bit. -John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.432 / Virus Database: 270.14.132/2610 - Release Date: 01/09/10 19:35:00 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In a message dated 09/01/2010 01:08:06 GMT Standard Time, kc0...@yahoo.com writes: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! I see it Unfortunately therefore I have to believe it Even more unfortunately, that still doesn't stop it being useless expensive crap:-( ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
The real touch of class is the zip tie holding the cap in place! gandal...@aol.com wrote: In a message dated 09/01/2010 01:08:06 GMT Standard Time, kc0...@yahoo.com writes: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! I see it Unfortunately therefore I have to believe it Even more unfortunately, that still doesn't stop it being useless expensive crap:-( ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Even more unfortunately, that still doesn't stop it being useless expensive crap :-( and even THAT doesn't stop me from still wanting one... drool :) My brother-in-law is in an electronics tech program at the local community college. I'll have him put it together for me. I'm sure that he could use the practice. Randy ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
In a message dated 09/01/2010 01:37:39 GMT Standard Time, scot...@yahoo.com writes: and even THAT doesn't stop me from still wanting one... drool :) My brother-in-law is in an electronics tech program at the local community college. I'll have him put it together for me. I'm sure that he could use the practice. Randy - If you're really serious, and do please stop drooling all over my monitors and keyboard, don't forget to ask him to use a gold plated mains plug and lead, you'll definitely need that to make sure it keeps perfect time. If your brother-in-law is too busy though I'm sure my friend Igor would be willing to help out. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era Bob On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Knowledge of history doesn't = having lived it :-) http://www.play-hookey.com/digital/electronics/dtl_gates.html 3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page above indicates. Stanley - Original Message From: Bob Camp li...@cq.nu To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, January 8, 2010 8:10:34 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era Bob On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
- Original Message From: Bob Camp li...@cq.nu To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Fri, January 8, 2010 8:10:34 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era Bob I guess you are refering to diode to transistor not diode to resistor ? Stanley ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
At high temperatures the circuits with the additional diodes in series with the base will have problems with transistor leakage currents when all inputs are low. The person who created that page doesnt know how to design reliable circuits. A base to emitter shunt resistor is one way of avoiding this problem. Bruce Stanley Reynolds wrote: Knowledge of history doesn't = having lived it :-) http://www.play-hookey.com/digital/electronics/dtl_gates.html 3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page above indicates. Stanley - Original Message From: Bob Campli...@cq.nu To: Discussion of precise time and frequency measurementtime-nuts@febo.com Sent: Fri, January 8, 2010 8:10:34 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era Bob On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote: http://transistorclock.com/ has a very interesting (though a bit expensive) kit for sale. A 10 x 11 circuit board sporting nearly 200 transistors and 600 diodes to drive six seven-segment displays. Suitable for framing... As delivered runs on 60hz but there is a note about conversion to 50hz mains. You can buy a bare board, just the components or a full kit. You must see it to believe it! Tom ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
I'm building one mostly for the nostalgia factor -- that plus it's a good use for that roll of 1000 1N4148 diodes I won at auction! I have just the divide by 60 down to 1Hz done. It works now that I found that one diode I put in backwards. Eventually I'll have to tie it to my Thunderbolt to make it time-nuts compliant. Now I remember why I've come to prefer SMD construction Scott On Jan 8, 2010, at 5:37 PM, Randy Scott scot...@yahoo.com wrote: Even more unfortunately, that still doesn't stop it being useless expensive crap :-( and even THAT doesn't stop me from still wanting one... drool :) My brother-in-law is in an electronics tech program at the local community college. I'll have him put it together for me. I'm sure that he could use the practice. Randy ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Digital Clock kit - no Integrated circuits!
On 1/8/2010 6:27 PM, time-nuts-requ...@febo.com wrote: You must see it to believe it! I won't buy one until it comes in surface mount.I *hate* flipping PCBs over and clipping leads. ;-) -ch ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
