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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I can't find any info on that transistor, but I suspect it is too small to drive a flyback.
You'll need a transistor that can be mounted on a heatsink. You can get these from things like car radios, TV's, monitors and power supplies, but I'd recommend buying one of the transistors mentioned earlier in this thread, as other people will be able to give you advice about them.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Ok, I assume it is a BJT (bi-polar junction transistor). It is sort of like a relay. You need to identify which terminal is the base, which is the emitter, and which is the collector.
You should be able to do this by reading up on transistor case/package types.
For example, if it is a TO3 case type, you can look up TO3 and identify which pin is which. (I think you'd also need to know if it is NPN or PNP,)
Without more information I can't really help much. Maybe someone else can add something?
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Go look up the datasheets of those transistors. You want one with high current, voltage, and power ratings; otherwise you'll have problems with transistors failing. The horizontal output transistor in a monitor or TV often works.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Well, the first one is a voltage regulator with a maximum output of 1 amp, according to the datasheet:
So, even if it could be used to switch a flyback (I'm not sure here) it wouldn't give big arcs.
I'll see what I can find on the others, but I'd still recommend buying one of the transistors mentioned earlier in this thread. You are bound to burn at least one out anyway, everyone does, that's how you learn.
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Flyback Question
