What I want to ask ... how to calculate the uH (coil or inductor) ? Do I need to wind the wire around ferrite core and how many turn and what size wire will be? I'm planning to get max 20A and transformer going to used is 230/15-0-15.
The PWM freq is about 200k using IC 555 as clock generator. I just dont know how to calculate how much inductor/inductance needed and how to make if I need to wind the coil.
There are some articles at this site http://www.smps.us
, that I have used some times.