Re: UPS in a wooden cupboard
This isn't directly answering the question either; but you can build an extremely simple fan control circuit using nothing but a potentiometer and a mosfet connected as an emitter follower. Fan noise drops rapidly as you drop the fan speed.
I did some experimenting with this a while back for a project (using a microcontroller rather than a potentiometer) and concluded that if you don't mind losing some energy in the transistor, voltage control is much quieter than PWM for fan control.
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