Re: UPS in a wooden cupboard
When I sorted out a 140mm mains fan that was very noisy the replacement was 12V DC.
I used a two secondary 9 volt transformer.
I found a double diode in an old computer power supply and fitted it between the two middle terminals and linked the outer terminals.
I added a capacitor of a value that gave enough average voltage according to the amount of noise I was prepared to put up with.
It has been working for years.
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