Hi all! I'm new here to, didn't know if it was best to create a new thread or relive an old one. I'm trying to build this same 555 power supply from the ledsales schematic http://www.ledsales.com.au/kits/nixie_supply.pdf .
I don't have ready access to a scope (thinking about buying that cheap DS0201, but it'll take 2 months to arrive and I'd like to have my nixies fired up before that), but I'd like to see if you could help me troubleshoot my circuit. I built a test circuit for my 555 and it flashes the leds as expected. Did a brief test with the IRF740 and BC547 and they seem fine too. I was using the IN4004 and afetr reading this tread, changed to the UF4007. It didn't change the output. I simulated the circuit on ISIS, just to check. It worked... With 9.4V input I'm getting between 0.142V and 0.200V (changing diodes) where I should get 170V. I reduced my input all the way to 3.4V and got 3.2V output. Now talking about the things that looked weird to me with 9.4V input: - I measured the voltage before the diode and it gave me -0.21V from ground. - Changing my trimpot does no effect whatsoever (but I tested it). - Replacing IN4004 with UF4007 didn't change the output. - The MOSFET is NOT overheating. (it was in another configuration that I corrected). Anybody has any thoughts? Thanks, Sam -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/fFzzJtoXIiUJ. For more options, visit https://groups.google.com/groups/opt_out.
