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.
