I'm tying to build a geiger counter with arduino and for the geiger tube to work it needs 400 volts. I found this project on hackaday and in this post 400 Volts is generated using a PWM signal of 10kHz. I'm wondering how does that work? how is a ESP8266 able to generate 400 Volts without a transformer or some other external power source?
If someone could explain it to me it would be much apreciated!