Introduction: How to Make a Car Battery Charger With At/ATX Power Supply

Picture of How to Make a Car Battery Charger With At/ATX Power Supply
It's very easy to make a very poerfull charger for car battery, uoy need a At or ATX Power supply with a especific power controller circuit: The TL494 or equivalent (DBL494, IL494, GL494, SL494, KIA494 OR KA7500).

With the old font, you need some componentes:
- LED;
- 15K Resistor;
- 680R resistor (for led);
- 10K potenciometer or trim-pot;

And conector an clips for the power charger.

To make de caherger you need to wel de trim pot (or potenciometer) in the pin 1 of the 494 (or equivalent) and the 15K resistor in line witch the genative.

Only this.

Then adjust to 13,8 volts and your charger is OK.

If don't can 13,8 Volts, you can try change the 15K resistor for an of 10K.

Is the best way to be a ecologic person, reuse an old font....

See the vídeo for more details (in portuguese...)



koleszar (author)2016-12-04

Because I am not electrician, like to ask something. The number 1 leg goes to pin 1 and what about number 2 and 3 legs of the trim-pot?

Need some help to make it! Please!

sudoukpong (author)2016-07-03

if two of the unite connect -,+,-,+ can it bring 24 volt?

Dillon2016 (author)2016-01-13

is it possible to get electric diagram of what you are doing or some better pics to see clear connections

sanjeev.saxena.9231 (author)2015-12-14

Can we have video with narrations in English please.

ValentinoM made it! (author)2015-09-05

very useful! it works!!

here's a picture of my temporary setup. lacking a 15K resistor I used a 100k pot and set it to about 15k. As you can see the PSU outputs 13.79V.

Sadly that battery isn't charging.. It remained discharged for a long time, I think it's trash now.

Mows (author)2015-07-25

good idea ,need a electric diagram of what you are doing to understand......

slatinski (author)2015-01-11

When i connect the pot and the resisitor the psu wont start :/ its ka7500

airton24x7 (author)2014-09-08

Olá, fiz as modificações, consegui os 13,8v após regular
o trimpot, quando ligo na bateria a fonte estala, barulho do cooler reduz, mesmo desligando da tomada continua ventilando puxando a carga da bateria... Alguma idéia? Quantos watts a fonte modificada? Obrigado.

imperiusPT (author)2014-04-15

Bom projecto.

For our English friends, in the video it is said only to use this on acid/lead batteries of 12V 20+A (car, boat, trucks, etc).

kalhelou (author)2013-10-01


eulerdgraca (author)2013-08-30

Too much current might damage your battery! Better read the battery specs before using this charger.

dreiseratops (author)2012-08-26

This looks really great but I cant tell.
Maybe the video would help. Closed captions in english?


dort (author)dreiseratops2012-08-26

Dear, in this week I try put subtitles in vídeo. Thanks for your comment.

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