(19-10-2017, 10:36 PM)Mark Hennessy Wrote: In theory, the switching frequency shouldn't affect the current draw from the mains because of the initial rectification. In practice, there will be an amount of the switching frequency leaking out, but I don't think it should significantly affect a moving iron current meter.Thanks for your replies, not sure if I made it clear but in this case the demonstration was setup with the current meter on the output of the electronic transformer.
I cant find the one where I saw the frequency as 22kHz but here is one which states the output as 42kHz.
http://www.electricsandlighting.co.uk/pr...ransformer
Mike
