Must be something with the inductor. If the circuit does not work, you should at least get 9.4 volt at the other end of the inductor. Measure the resistance of the inductor, it should be low (<10 ohm) and check its connections. From: Matzenegger Sent: Sunday, July 29, 2012 3:38 PM To: [email protected] Cc: [email protected] Subject: [neonixie-l] Re: 555 power supply not working
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. -- 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]. For more options, visit https://groups.google.com/groups/opt_out.
