This 120V AC power source is built with a simple 120V:24V or 110V:24V center-tapped control transformer and four additional component ... use larger transformers and transistors. This type of 12V ...

There’s a big transformer taking up half of the footprint. This steps down mains voltage to something a 7824 regulator can handle. That’s a 24V linear regulator which is fed by a bridge ...

I had (still have) a 24V fan. It's a Papst 8414M, rated 24V 1,4W. However, it says on it that it works for 12V-24V.<P>Anyhow, it is a tornado at 24V, and at 12V it is quite nice. So if this fan ...