I've got a 32 volt DC regulated bus. I also need about 30mA at 12 volts (DC). Is there an easy way to tap some power from the 32v bus?
My first thought was just put in a 12v linear regulator. But those in my parts box have absolute ratings close to (or below) 32v, and I'm not one to push the envelope.
Some divider make up using hairy arsed power resistors might work, but that's not too efficient and generates HEAT.
If the solution gets complicated (e.g. build a buck down converter), I could find a 12v wall wart and tie across the mains supply to my 32v power supply.
I know about voltage multiplier circuits. Is there a neat voltage divider trick somebody can teach a nubie?