I have had a Canon X61884803 calculator display board for some time and I am in the process of trying to use this directly rather than pull the tubes from it. I figured out the basic circuit for it and put together a lash-up to drive it. Naturally it is multiplexed and LTSpice shows that 120Hz is a likely frequency.
I subsequently found an actual circuit diagram, for a calculator that uses this, here: http://madrona.ca/e/eec/calcs/Monroe650.html and it was interesting to see the voltages being used. I haven't tried to reproduce those voltages, instead driving it with a fairly standard set of 0V GND, 200V for VH-1, 100V for VH-2 (cathode pullup) and 12V 'logic level' input to the cathode transistor base resistor, though I have tried 8V through 20V for this. I have only wired up a few of the connections to show I am on the right path with this, but now I am trying to figure out the ghosting. With that in mind, does anyone have the specs for the TMC1764 shown in the circuit diagram? Or, if anyone has access to a calculator that uses this display board, I would be interested to know the voltages on the outputs of this chip and perhaps even the timings? It could also be that I need to actually wire all the connections up and see how it looks... Thanks. -- 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/22e8eedc-f5f6-4f5e-bba4-e4dccc0115fao%40googlegroups.com.
