/diy/ - Do It Yourself

>>1439283
there are many such designs based on the 555 timer IC

>>1439302
meh, we mostly deal in small signal shit here. "electrical cad" is a good search term to find programs specifically adapted to industrial electrical applications, if no panelfag chimes in with a more experienced recommendation

>>1439289
be sure to check the datasheets on those cores and make sure they're designed for 60/120Hz power applications, not RF. also, too many turns will saturate the core and waste energy in heat, which could impose its own duty cycle limitation