today I tried to make my own Tesla coil circuit according to the schematic below, except that I have changed the number of turns on the secondary and primary so could get a higher output voltage (1 to 500+ turns). That's what I was trying to do. But I have come across a problem. I used Power transistor (BD243C) instead of the 2222A. I wired up my circuit according to the schematic below with red LED, 9V battery but without switch to see if it's at least working.
The circuit doesn't work as expected. My LED didn't light up, transistor is heats up. There are voltage drops in the circuit which I probed but no sign of high voltage output. Can anyone notice something weird and tell me?
Thanks to everyone who post a sensible and helpful answer.