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Cheap DC-DC converter?
By zmoz, Section Homebrewed Electricity Posted on Mon Nov 29, 2004 at 01:20:13 AM MST
Something that will step up 12v to about 18v?

I'm trying to make a charger that will charge one 12v battery from another at a low current. What I need is some sort of DC-DC converter that will step up the 12v to around 18v so that I can use an LM317 to limit the current. Does anybody know where I can find such a converter for cheap? I know there's alot of surplus electronic places that might have such a thing...

Cheap DC-DC converter? | 3 comments (3 topical)

Re: Cheap DC-DC converter? (3.00 / 0) (#1)
by tecker on Mon Nov 29, 2004 at 03:17:14 AM MST

Two inductors in series with caps on the in and out will work to give a good amperage out I am working on scaling down a Bill Muller we rlc circuit I works but frankly It's one of those things I tried but It got too hot and It's gathering dust .
here's the link If you want to give it a try.

http://theverylastpageoftheinternet.com/ElectromagneticDev/muller/rlc_circuit.htm

Re: Cheap DC-DC converter? (3.00 / 0) (#2)
by Opera House on Mon Nov 29, 2004 at 05:12:38 AM MST

Forget the 317. Use an LF494 switching regulator. With just a couple parts, you can limit the max voltage and current. That IC and most of the parts you need can be found in an old computer power supply.

Re: Cheap DC-DC converter? (3.00 / 0) (#3)
by wooferhound on Mon Nov 29, 2004 at 09:25:43 AM MST

Windstuffnow had asked this question a while back with lots of great comments.

http://www.fieldlines.com/story/2004/11/15/102644/67

)}=- W o o f -={(

Cheap DC-DC converter? | 3 comments (3 topical)

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