Thanks for a fast reply! As posted, http://www.ledsales.com.au/kits/nixie_supply.pdf I used exactly the same parts, made exactly the same PCB. I really don't know what's wrong with it. I test all my parts before using them (except the 555s, FETs and inductors). All new. Could it be the cheap-chinese factor? I've heard they like to sell fake MOSFETs
Thanks a lot Imbanon On Nov 18, 8:55 pm, Per Jensen <[email protected]> wrote: > Which kind of FET and Diode are you using ? > > Do you have around 100nF of decoupling directly across the power pins of the > 555 ? > > Gimme a link to the shematic you used. > > // Per. > > On 18/11/2011, at 20.43, Imbanon wrote: > > > > > > > > > Hi all. > > > Yeah, another thread about this > > supply..http://www.ledsales.com.au/kits/nixie_supply.pdf > > I know I could and should have made that Maxim power supply, but I > > didn't. So now I'm stuck fixing this with loads of spare parts I've > > got... except for the FETs.. > > > Anyways, the supply isn't working. The first one I made worked just > > fine for 15 minutes, powering 6 IN-14 at 170 volts (multiplexed). Then > > I set it to 200 volts (to get RMS of 2mA), which worked for 5 minutes, > > and then smoked and failed. > > I made another on a quick PCB, which just smoked immediately when I > > switched it on. The same thing happened to the newest, breadboarded > > one. > > The MOSFET seems to overheat instantly and smoke out. Having nothing > > to lose (except the molten hole in the breadboard), I left it powered, > > to see the diode smoking next. Aparently, its still in working order > > (so says the multimeter). > > Heat sinking FET only makes it last longer in not working state before > > it smokes. > > > I tried replacing inductors, 555s, diodes, transistors.. > > What the F**K do I do people? Losing my head here! > > > And yeah, I'm powering it at 12 volts, tried 5. Output is always 3-6 > > volts. -- 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 this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
