Re: [time-nuts] PCB for frequency dividers
Dear Dave, If there is one board left, I would like to buy and try one. Shipping will be to the Netherlands, so that won't be a problem. Could you send met the BOM and the circuit diagram? Thank you, Best regards, Jeroen David C. Partridge schreef: I've taken a bit of a risk and ordered 20 boards. Rash in extreme or what! What does this mean? It means that I can sell the boards at a price of GBP20 each (about USD40). I will not request $$$ or ship any boards until I have made up my own first to confirm everything is OK. This won't be until end August as some parts are on back-order with Mouser. Please email me direct if you would like to pre-order any. If you would like a copy of the circuit diagram, or the BOM (.xls file) just shout (it's complete bar the thumbwheel switch, and wire). Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Ing. Jeroen Bastemeijer Delft University of Technology Department of Electrical Engineering Electronic Instrumentation Laboratory Mekelweg 4, Room 13.090 2628 CD Delft The Netherlands Phone: +31.15.27.86542 Fax: +31.15.27.85755 E-mail: [EMAIL PROTECTED] GPS: Lat N52.2 Lon E4.37157 Alt 46.2m ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PCB for frequency dividers
David, I am interested in your PCB and frequency divider project. How can I contact you directly? Joe ([EMAIL PROTECTED]) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David C. Partridge Sent: Tuesday, July 29, 2008 11:12 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] PCB for frequency dividers I've taken a bit of a risk and ordered 20 boards. Rash in extreme or what! What does this mean? It means that I can sell the boards at a price of GBP20 each (about USD40). I will not request $$$ or ship any boards until I have made up my own first to confirm everything is OK. This won't be until end August as some parts are on back-order with Mouser. Please email me direct if you would like to pre-order any. If you would like a copy of the circuit diagram, or the BOM (.xls file) just shout (it's complete bar the thumbwheel switch, and wire). Dave ___ 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] Leap Second Pending
The mechanical clepsydra shown overleaf is simple in operation. The cylindrical vessel is slowly filled with water and a float with a stem and rack engages the wheel to which the hour hand is attached. As the vessel fills so the float rises and the hour hand is made to rotate. When the vessel is full it is emtied (sic) and the process starts over again. While this type of clock is spectacular and one would like to think it is of ancient origin, it has to be recorded that no ancient example has been handed down to us. Actually, if I'm visualizing this correctly, a similar design was built by the ancient Greeks. I recall a article in National Geographic about the Tower of the Winds (or similar). The source of the water stream was a tank that constantly overflowed, maintaining constant water pressure. There was little to go on as far as actual physical evidence, so maybe it was wishful thinking and has been debunked since? -Dave ___ 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] What is a Time-Nut grade Zero Crossing Circuit?
Can you point me to a Time-Nut grade Zero Crossing circuit that I can feed a Actel Igloo FPGA (It doesn't like sine waves)? For the sake of discussion the source signal is a ThunderBolt at 10 MHz. The FPGA is rated to 350 MHz, so no need to have a 5. GHz Zero Crossing circuit. ;-) The FPGA has several interface styles, so we are not limited to just TTL or CMOS. Suggestions? ___ 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] Leap Second Pending
[EMAIL PROTECTED] wrote: The mechanical clepsydra shown overleaf is simple in operation. The cylindrical vessel is slowly filled with water and a float with a stem and rack engages the wheel to which the hour hand is attached. As the vessel fills so the float rises and the hour hand is made to rotate. When the vessel is full it is emtied (sic) and the process starts over again. While this type of clock is spectacular and one would like to think it is of ancient origin, it has to be recorded that no ancient example has been handed down to us. Actually, if I'm visualizing this correctly, a similar design was built by the ancient Greeks. I recall a article in National Geographic about the Tower of the Winds (or similar). The source of the water stream was a tank that constantly overflowed, maintaining constant water pressure. There was little to go on as far as actual physical evidence, so maybe it was wishful thinking and has been debunked since? DeCarle was an old guy in the 1960's. What he is referring to is a picture in the encyclopedia of a clock that has a float attached to a rack that drives a pinion attached to an hour hand. The water is directed into the tank, and as the tank fills, the hour hand rotates indicating the time. When the tank is full, a valve is tripped letting the water out of the tank, and the cycle repeats. He acknowledges that there were clepsydra's used in ancient cultures, just not one as cool as the one shown in the picture. -Dave ___ 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] What is a Time-Nut grade Zero Crossing Circuit?
Hi Bob, since the sine wave is symmetric, you can use a simple LVC type CMOS inverter with 1M Ohm resistor from input to output, and a 100nF cap (or the largest COG cap you can find) from the input of the inverter to the sine wave output. You may also want to load the sine wave output with 50 Ohms, as required by the source. This works very well. Don't use a schmitt trigger inverter though. bye, Said In a message dated 7/30/2008 17:35:46 Pacific Daylight Time, [EMAIL PROTECTED] writes: Can you point me to a Time-Nut grade Zero Crossing circuit that I can feed a Actel Igloo FPGA (It doesn't like sine waves)? For the sake of discussion the source signal is a ThunderBolt at 10 MHz. The FPGA is rated to 350 MHz, so no need to have a 5. GHz Zero Crossing circuit. ;-) The FPGA has several interface styles, so we are not limited to just TTL or CMOS. Suggestions? **Get fantasy football with free live scoring. Sign up for FanHouse Fantasy Football today. (http://www.fanhouse.com/fantasyaffair?ncid=aolspr000520) ___ 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] Complete Lucent RFTG setup on eBay
There have been lots of messages about how the Lucent RFTG disciplined oscillator bits work in a system. This, from its appearance, is the entire set up with all necessary cables and proper connections: 1 - Lucent RFTGm-II-Rb 15MHz Frequency Reference with 10MHz output 1 - Lucent RFTGm-II-XO 15MHz GPS Disciplined Frequency Reference Interconnection cable set and mounting frame eBay item # 300244547378 (This is not my auction; I have no relation to the seller.) The (quite detailed) pictures alone are worth a look if you are interested in this gear. -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.
Re: [time-nuts] What is a Time-Nut grade Zero Crossing Circuit?
[EMAIL PROTECTED] wrote: Hi Bob, since the sine wave is symmetric, you can use a simple LVC type CMOS inverter with 1M Ohm resistor from input to output, and a 100nF cap (or the largest COG cap you can find) from the input of the inverter to the sine wave output. You may also want to load the sine wave output with 50 Ohms, as required by the source. This works very well. Don't use a schmitt trigger inverter though. bye, Said Said Noise is lower if you use a pair of resistor to bias the inverter input at the threshold rather than the feedback resistor. A feedback circuit can be added to stabilise the output duty cycle. If you want subpicosecond jitter you need to use a different device/logic family. Bruce ___ 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] Complete Lucent RFTG setup on eBay
I have no connection with this seller, but have done business, several times in the past, and consider them to be very reputable. Had, K7MLR --- At 07:54 PM 7/30/2008, you wrote: There have been lots of messages about how the Lucent RFTG disciplined oscillator bits work in a system. This, from its appearance, is the entire set up with all necessary cables and proper connections: 1 - Lucent RFTGm-II-Rb 15MHz Frequency Reference with 10MHz output 1 - Lucent RFTGm-II-XO 15MHz GPS Disciplined Frequency Reference Interconnection cable set and mounting frame eBay item # 300244547378 (This is not my auction; I have no relation to the seller.) The (quite detailed) pictures alone are worth a look if you are interested in this gear. -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. ___ 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.
