I am helping my son make a mini-Tesla for his science fair project and came across a problem I can't figure out. I am following this diagram (pretty much, but without the LED):
Also, I am not sure of the exact number of windings - around 300 of 27 AWG wire. I have experimented with 2 to 6 primary coil windings and can make this work with 3 windings of the primary coil. My problem is that I have burned up two transistors already - not right away, the circuit works and I can turn a bulb on but the transistor is getting VERY hot. Why? Do I need
- fewer or more primary windings?
- a different type of transistor?
- a heatsink?
- a different value resistor or an additional resistor or capacitor (don't ask, but I have seen other versions of this mini Tesla)
- just need to buy more tansistors and hope for the best?
Thanks in advance.