Problem withs musical tesla coil

Thread Starter

bahi jh

Joined Nov 12, 2019
I am trying to make the musical tesla coil circuit from the following video
tesla coil.jpg

with this schematic.
At the moment i just want to produce the spark from the end of the tesla coil so i haven't added the audio input or the capactiors.

I have been told that both LEDs light up when the circuit is working correctly for some reason when i use the 2N2222 transistor the LEDS light up but no spark is seen on the coil. but when i replace it with a high power transistor BD243C or TIP41C so i can give the circuit more power the LEDs won't light up.
I am using the mosfet 80NF70
Why is it that the LEDs light up for only 2N2222 and not for BD243C?

also any advise on implementing the circuit would be appreciated thankyou
Last edited:


Joined Sep 30, 2009
Is your circuit just humming? Maybe it doesn't know the words. Sorry for that, but it makes as much sense as calling that circuit a Tesla coil circuit.


Joined Jun 22, 2012
Your led across the transistor BE wont work as it's only getting 0.7V, the led wired to the coil only has one pin connected, so how that works is a miracle!!