That was it, just a bad inductor... Kind of ashamed now, but happy you helped me get this beauty working!
Thanks! :D Sam <https://lh6.googleusercontent.com/-FwF7XrMnC24/UBXwk1CtetI/AAAAAAAAByU/2TS4cDbgyVI/s1600/IMG_0474.JPG> On Sunday, July 29, 2012 10:21:25 PM UTC-3, Matzenegger wrote: > > Bingo. It doesn't give a resistance value. > I'll get a new one and post the results. > > Thanks to you and al the guys that replied, and I'm sorry I couldn't reply > as romptly as you did. > See ya, > > Sam > > On Sunday, July 29, 2012 5:54:22 PM UTC-3, Frank Bemelman wrote: >> >> 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 <[email protected]> >> *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]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/ITZ9tR9RrzgJ. For more options, visit https://groups.google.com/groups/opt_out.
