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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Have you tried swapping the connections to the feedback coil round?
I've not looked up the base voltage for the Fairchild BJT, but if it is different to the 2N3055 that may also be a problem (different resistor values may be needed)
270 and 22 Ohms should be ok if everything else is ok, though.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
How do I swap the feedback coil that don't make sense to me, thanks for helping!
Yes it's mounted on one fo my CPU heat sinks, copper heat pipes with a good fan.
I set one up, and I measured the voltage on the base and it was 0.86 volts and on the collector was something like 11 odd volts, The emitter was around the same too. It looks like I've done it right nothing is hot, noting seems bad at all :(
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
I know I have wired it right, I did have trouble with the two resistors but I understand it now, it is a voltage divided, and it should work now, but it doesn't :(
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Platinum
Your circuit is a classical oscilator and it works very well. It will provide you hf and high voltage. Let us know more about what you are doing.... How many turns the feedback coil have ?? Wire size ??
How many turns the primary coil have ?? Wire size ??
Some Pictures??
Ash Small advise you to just switch the two ends of the feedback coil. This is very important in this type of oscilator. Try to invert the teminals of the feedback coil.
A 12V 100W car headlight bulb conneted between the + of the poweer suppy and the + of your circuit will limit the current to 10A, avoiding blow up your transistor. Them you may adjust the 27 ohm resistor for best output...
The Secondary may have open or short circuited turns, preventig the oscillations. Pictures ..
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