It might be a bit premature but I am working on a MK5017 emulator. It is a 2 board stack the size of the Mostek chip that (hopefully) plugs into the socket to replace the original chip. The top board holds an 8051 chip (SiLabs C8051F381-GQR) and a DS3231S clock chip. The lower board has the 15V to 3.3V power supply and the 3.3-15V translators to look like PMOS logic. I also have a development board with power supplies, drivers, switches and 7 segment LEDs to simulate the main clock for code development. There is also a connection to allow GPS + PPS synchronization.
The PCBs are in and as soon as I can work with a microscope, I will assemble and work on the construction. I will make everything available including OrCad schematics, Allegro layouts, bare PCB, code etc for anyone interested. -Bill- On Tuesday, November 10, 2020 at 8:20:19 AM UTC-8 Richard Scales wrote: > Thank you, that signal is present in all its glory. I got a circuit > diagram and could see that it was rectifying AC from the transformer so > that was the first place I looked. The signal was good. Given that the > clock chip is multiplexing the displays nicely I'd be surprised if it had > failed. > I've also checked that all the various switch contacts are good and they > do seem to be. > I don't think that replacement clock ICs are going to be that easy to > locate! > Richard > > > On Tue, 10 Nov 2020, 16:08 Bill Stanley, <[email protected]> wrote: > >> A possible cause of the failure to count is the 60Hz signal the clock >> uses for a time base. Look at pin 23 of the MK5017 with a scope for a half >> wave 60 (or 50) Hz signal. >> >> -Bill- >> >> >> On Tuesday, November 10, 2020 at 7:10:26 AM UTC-8 Richard Scales wrote: >> >>> Thank you. I have a Heathkit clock that needs some assistance. It does >>> everything it should do apart from increment the time. The clock chip is >>> driving the displays so I'm thinking it's OK but it just won't count time. >>> I wasn't thinking of offering a kit but if anyone has a set of SP-101's >>> then I can help out with Pcb's for this version as well as another one that >>> I hope to have ready soon. >>> Richard >>> >>> >>> On Tue, 10 Nov 2020, 14:11 martin martin, <[email protected]> wrote: >>> >>>> Your clock looks great! I'm currently fixing this 1970s Heathkit with >>>> an overheating power transformer. >>>> >>>> And yes! I would be interested in a kit >>>> >>>> >>>> >>>> ~ >>>> *[email protected]* >>>> >>>> >>>> On Tue, Nov 10, 2020 at 6:04 AM Richard Scales <[email protected]> >>>> wrote: >>>> >>>>> I could make plans available, or all hinges on having the displays. >>>>> The rest of just smart sockets albeit ones I made work for these 7 >>>>> segment displays. >>>>> I have another design which is a direct drive approach and is >>>>> therefore much simpler in terms of hardware whilst the software has to do >>>>> a >>>>> lot more of the heavy lifting. >>>>> I'll show that when ready. I'm just waiting on updated pcb's to arrive. >>>>> Richard >>>>> >>>>> On Tue, 10 Nov 2020, 13:58 Michail Wilson, <[email protected]> wrote: >>>>> >>>>>> Love it. >>>>>> >>>>>> >>>>>> >>>>>> Plans, Open source, only one or making a kit available? >>>>>> >>>>>> >>>>>> >>>>>> Michail Wilson >>>>>> >>>>>> 206-920-6312 <(206)%20920-6312> >>>>>> >>>>>> >>>>>> >>>>>> *From:* [email protected] <[email protected]> *On >>>>>> Behalf Of *Richard Scales >>>>>> *Sent:* Tuesday, November 10, 2020 1:39 AM >>>>>> *To:* neonixie-l <[email protected]> >>>>>> *Subject:* [neonixie-l] SP-101 Clock, finshed at last! >>>>>> >>>>>> >>>>>> >>>>>> I've finally completed this: Six SP-101 panaplex displays being >>>>>> driven by 'smart sockets' which are getting their instructions from a >>>>>> Teensy Micro. >>>>>> >>>>>> >>>>>> >>>>>> A Wemos provides NTP sync, sensor reading (temperature and pressure) >>>>>> , Web scraping (local wind speed and direction) and random words. >>>>>> >>>>>> >>>>>> >>>>>> It does the best it can with only 7 segments. Also includes microwave >>>>>> motion detection so the thing is only displaying data when there is >>>>>> someone >>>>>> there to see it! >>>>>> >>>>>> >>>>>> >>>>>> I got green pcb's so the case is especially tinted to match. >>>>>> >>>>>> >>>>>> >>>>>> - Richard >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to the Google >>>>>> Groups "neonixie-l" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>> send an email to [email protected]. >>>>>> To view this discussion on the web, visit >>>>>> https://groups.google.com/d/msgid/neonixie-l/4eb4cac2-d704-4464-8789-f13d1491b881o%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/neonixie-l/4eb4cac2-d704-4464-8789-f13d1491b881o%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>>> -- >>>>>> You received this message because you are subscribed to a topic in >>>>>> the Google Groups "neonixie-l" group. >>>>>> To unsubscribe from this topic, visit >>>>>> https://groups.google.com/d/topic/neonixie-l/l9hzbmAmbnY/unsubscribe. >>>>>> To unsubscribe from this group and all its topics, send an email to >>>>>> [email protected]. >>>>>> To view this discussion on the web, visit >>>>>> https://groups.google.com/d/msgid/neonixie-l/MW2PR0102MB3435BA7FADF3ECBE89602C1482E90%40MW2PR0102MB3435.prod.exchangelabs.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/neonixie-l/MW2PR0102MB3435BA7FADF3ECBE89602C1482E90%40MW2PR0102MB3435.prod.exchangelabs.com?utm_medium=email&utm_source=footer> >>>>>> . >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "neonixie-l" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion on the web, visit >>>>> https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s_XAK3Ae94SfkOM_5woKdpGyoKkuX%2B0px5BUs4eYvH8fw%40mail.gmail.com >>>>> >>>>> <https://groups.google.com/d/msgid/neonixie-l/CA%2B9r3s_XAK3Ae94SfkOM_5woKdpGyoKkuX%2B0px5BUs4eYvH8fw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "neonixie-l" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/neonixie-l/l9hzbmAmbnY/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected]. >>>> >>> To view this discussion on the web, visit >>>> https://groups.google.com/d/msgid/neonixie-l/CAKYv7NSU6dMJzM6zbQkUo6EVpnxfuPTQ1kdZo%3D3oWjEmsTmYkg%40mail.gmail.com >>>> >>>> <https://groups.google.com/d/msgid/neonixie-l/CAKYv7NSU6dMJzM6zbQkUo6EVpnxfuPTQ1kdZo%3D3oWjEmsTmYkg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/l9hzbmAmbnY/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> > To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/0c5a7be4-5cdd-486a-b2c8-f98459e22eben%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/0c5a7be4-5cdd-486a-b2c8-f98459e22eben%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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