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24v To 12v Stepdown Converters???

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New Member
I am very new to electronics as a hobby, but I am looking for information on building a step down convertor.

I work with heavy equipment and want to put a radio in my drill but it is a 24 volt system and the radio is a 12 volt.

can anyone point me in the right direction??



Active Member
See if you can tap off the batteries at the 12v point


want to put a radio in my drill
Is that something like putting a fish on a bicycle? :lol:

I assume this is not your ordinary hand powered drill... maybe a truck-mounted auger? If it is a truck, you can almost definitely tap off one of the 12V batteries.


New Member
Thank you all again for the response and advice.

I'll look at the 7812 requlator

It is a 38 ton tracked crawler that is powered by a Detroit diesel Engine.
The Batteries are Mounted on a deck about 15 feet from the cab and they are two twelve volt bats in series.

all of the wiring in the cab is 24 volt. i tried once to see if one was 12v but, alas, they all tested out at 24v. :)


New Member
Sounds like you are in luck - since the batteries are 12 volt each. Instead of running your radio power wires to the cab wiring, just get longer wires and follow Phasor's suggestion. Wires are cheap and work evert time.

If you opt to build the 7812 circuit, be sure to purchase one that can handle the current draw of your radio (an old car radio perhaps ?) and mount it to a heat sink 'cause it will get hot.


New Member
24V to 12 V

If you plan to go to highter ampereage IE amplifiers, 4x50W Car radio etc.
you should check out so-called buck-converters. they have nearly no power loss. A starting point may be http://www.maxim-ic.com/cookbook/powersupply/index.cfm but there must be simpler designs available somewhere.

Someone knows of simple controllers for buck/boost converters ?

Hope this helps a bit.
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