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/-/1jGjpzbR5AIJ. For more options, visit https://groups.google.com/groups/opt_out.
