Powering 16F628 From Stable 12vDC

[Gevo]

I use for a lot of applications the LT1933. (Linear Technology)

A very small device, external a few resistor, diode and 1 coil of 22uH.

See the internet for specs.

[CocaColaKid]

We currently use th LM2574-5.0 just for this reason. Our 5V line require around 200mA-300mA which when run through a linear regulator I could probably heat my house since our source voltage is 24VAC which comes up to around 30-35VDC. The regulator works quite nice and is pretty cheap. I've run it up to about 350mA-400mA and it does get warm to the touch but not hot by any means.