Leftyretro
New Member
Well I don't have any specific circuit in mind but it would seem to me that it (an active variac) would be pretty straight forward. There are class D audio amplifiers designs available today and that is a form of PWM and of course audio amps can cover 60/50hz.
So it would seem to me just a matter of a putting together a precision low level audio oscillator followed by a variable gain stage followed by an audio class D power amp stage. Make sense?
So it would seem to me just a matter of a putting together a precision low level audio oscillator followed by a variable gain stage followed by an audio class D power amp stage. Make sense?