good point. but Im using a 50VA toroid from jaycar, and driving the 230V winding, so Im pretty sure I'll stay a long way below Bsat (about 10%)
but I *do* drive it at 5Hz. but seeing as its no greater than 10% rated volts, I wont overflux the transformer. I may, at full voltage, get close to the peak design flux, which for some cheap shit transformers is often > Bsat
Cheers Terry