Hello! I'm new here, but I've been following the OU scene for a long time. I apologize in advance for my bad English.
Ok, not to be late. In one of my experiments, I was inspired by a video:
I tried too. I used a regular audio amplifier. I stepped up the voltage to 800V with a transformer and got a really nice resonance display on the primary coil. If there is any interest, I will of course provide more detailed information.