Cheap IGBT

I have 4 igbt's that costs 4€ for one

@nikisalli Do they meet the specs I described? If yes, holy cow! Where did you buy them?

Depends on exactly what you nees. You can find them from 50 cents each to 100$ each. The most expensive transistors, can go into the thousand range for one.

I founded my igbt's in an electronic board but they're only 84A 1200v not 300 :/ and they can go at 30khz max :-(

@nikisalli Thanks for answering but that's not gonna cut the mustard for me ;)

@thebugger Can you maybe point me in a somewhat more specific direction? Like an Internet shop or something.. I have searched the internet extensively but have yet to find any good products...

It's not about the shop per se, but the parameters you require. If you want a high voltage high current and high frequency device, it's bound to be expensive. Try to dial down on any one parameter. For what application do you need it?

yeah you're looking for a pretty serious slab of silicon there so it's going to cost you. €30 sounds alright. what are you making? tesla coil?

I see those igbts only in tesla coils and very high power industrial maschines, I guess (and hope) he is going to make a tesla coil because I really love them

I might make a tesla coil ;)

I have accepted the high cost though, so it's gonna take some time to finish.

Make a spark gap tesla coil. Do you think tesla had transistors when he invented his coil in 1891. Even the first vacuum tubes didn't appear until 1903. The idea is to step up the mains voltage to the point where it starts arcing between two poles. Usually sparks are very harmonic rich, and contain almost the whole spectrum. Then you make a second transformer with a resonant circuit in the primary. The sparks excite high frequency oscillations in the primary of the tuned transformer, which is also a step up transformer. The induced voltage on the secondary is very high frequency and very high voltage and it breaks through air insulation to produce magnificent sparks. An other, more modern approach is to feed the tuned primary with high frequency pulsed voltage, from let's say a blocking oscillator, which results in the same effect, but as you said, if you want the coil to be large and powerful, you'd need mighty transistors to handle the spikes.

Thanks for the explanation! I've never built a tesla coil before so it's gonna be quite some theory I have to go through before hand.

I too haven't build a tesla coil, and i wouldn't. It's dangerous because the voltages involved are often so high, that it could create a voltage ark across a few cm and still smite you, even though you're not touching it directly. I really don't suggest making tesla coils, they're dangerous. Try a jackob's ladder. It's less dangerous, and i think there are some pretty simple circuits with a 555 timer.