I think I've done this before but cant remember how.
I want to build a pyrography woodburning pen for the mrs, one with more grunt than a little soldering iron.
And to keep things simple I've rewound the secondary of a 150va transformer to produce 3.5v at a lot of amps, and I need to regulate the ac input, this is how expensive commercial ones do it.
So I need a little circuit that will 'dim' the incomming ac, but obviously one that triggers at the same point either side of the mains waveform so little dc is produced to nuke the tranny.
Any ideas or links?
I want to build a pyrography woodburning pen for the mrs, one with more grunt than a little soldering iron.
And to keep things simple I've rewound the secondary of a 150va transformer to produce 3.5v at a lot of amps, and I need to regulate the ac input, this is how expensive commercial ones do it.
So I need a little circuit that will 'dim' the incomming ac, but obviously one that triggers at the same point either side of the mains waveform so little dc is produced to nuke the tranny.
Any ideas or links?