There was heavy rain the day before yesterday, and the gusts were said to have reached level 10, which eventually caused multiple line failures.This was taken at around 6 o'clock in the evening before
[i=s]This post was last edited by Fengxiaren on 2021-1-16 22:05[/i]The specific circuit diagram is this, Add a chip pin diagramNowRemove D2 and D3 at the back end, do not solder the inductor, and sold
The circuit principle is as follows: 6N137 isolates a PWM signal, the frequency is 2-10K, and now there is a very annoying "step", about 2 microseconds, the voltage is around 5V. I don't know why this