There is one MK5017 clock that uses PNP transistors in the book I scanned which you can download from here: https://groups.google.com/g/neonixie-l/c/Ov-mzZ_pDig/m/G95NMJPKBQAJ it doesn't seem to use SP352s but at least a Panaplex display.
/Martin On Monday, 18 January 2021 at 04:59:28 UTC+1 N9KTW wrote: > Yes, thank you I have seen it. I am currently trying to make a schematic > of the power supply that is on the clock that I have. I have no voltages > higher than about 125 ish in the clock. The 15Volt for the chip is derived > from a zener on a 55 Volt line. Also Heath uses NPN transistors , and my > unit is using PNP's. I am going to look and see if I have any other > panaplex clock diagrams ....... > > Howard > > On Sunday, January 17, 2021 at 7:23:39 PM UTC-6 J Forbes wrote: > >> did you see this? >> >> http://www.decadecounter.com/vta/pdf/gc1092d_schematic.pdf >> >> >> On Sunday, January 17, 2021 at 3:35:14 PM UTC-7 N9KTW wrote: >> >>> Well I found another clock to work on, using SP352 displays........ It >>> is marked DIGITAL CONCEPTS CORP, EC102 electronic calendar clock. >>> >>> It uses 3 SP352's for a 6 digit display. A MOSTEK 5017BA chip to run >>> things. >>> >>> The display doesnt light up, at all. In attempting to check voltages, I >>> cannot find any above about 125 (this seems VERY low for the panaplex >>> displays) I have been told that this is similar to a HEATHKIT GC1092d. >>> >>> Anyone got any ideas, maybe a schematic for this guy????? >>> >>> T I A >>> >>> de Howard, N9KTW >>> >> -- 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/eb9dc1d0-bf2f-4dc8-85a5-e8030a781445n%40googlegroups.com.
