On Thursday, April 4, 2013 7:03:19 AM UTC-5, Terry S wrote: > The 4503 is an tri-state device -- do you need pullups on the outputs? > I can't tell from a quick glance how you are using it. How about > series resistors to the bases of the transistors? I see those on A1 > thru A4. Without some series resistance your driver can only go to .7 > (Vbe) and I'm not sure how well it will like being clamped that low. >
I'll look again; but pretty sure the 503 is a cmos device - not open drain. I actually tried a series resistor on at the base of A5; no impact. It was the reason I could wire the base to the series resistor to show that the digit works when the circuitry is bypassed. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/L-kyquhC28UJ. For more options, visit https://groups.google.com/groups/opt_out.
