I once built a power supply for a microphone using two 230VAC to 12 VAC transformers, or something close to that.
The first, connected to the mains AC socket fed the heater supply voltage rectifier, as well as the secondary of the second transformer, which I wired backwards, to get 220 VAC. The second transformer was smaller than the first.
Worked fine, and it was relatively cheap.
Not sure about high-current circuits, though.
Both transformers were toroidal. I don't know if that makes any difference when wiring up a transformer backwards.
The first, connected to the mains AC socket fed the heater supply voltage rectifier, as well as the secondary of the second transformer, which I wired backwards, to get 220 VAC. The second transformer was smaller than the first.
Worked fine, and it was relatively cheap.
Not sure about high-current circuits, though.
Both transformers were toroidal. I don't know if that makes any difference when wiring up a transformer backwards.
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