"Gunner" wrote in message
...
Ok...Im way way out of practice on my basic electronics...blush

I found a 12vt dc diaphragm pump of the same type thats in the tig
coolant unit I was given. (Lincoln Magnum)

The old pump and all the gizmos were fed 24vt ac. I did find a tiny
full wave rectifier inside the pump, which apparently only had bad
brushes. Unfortunately..I didnt get all the parts to the motor, else
Id simply stick in a new set of brushes and voila.......sigh

The new pump is 12vdc at 7 amps. The rectifier is no biggie.

What is the best way to drop the 24vac down to 12v?

Dropping resistor? Ok....blush..what value and wattage do I use?

(sounds of derisive laughter in the backround...sigh)

DC-DC converter? Ok..where and how much?

Thanks...

Gunner





"If I'm going to reach out to the the Democrats then I need a third
hand.There's no way I'm letting go of my wallet or my gun while they're
around."

"Democrat. In the dictionary it's right after demobilize and right
before demode` (out of fashion).
-Buddy Jordan 2001

It would need a big resister to do that, at least 84 watts and it would make
allot of heat. I would look for a replacement surplus transformer that
output at 12v then use a bridge rectifier or build a power supply with the
24v transformer. The power supply is probably the least expensive.

It could be made with a 7812 voltage regulator and a few pass transistors.
MikeH