Introduction: 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...)


Tks!

Comments

author
koleszar made it!(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!

author
sudoukpong made it!(author)2016-07-03

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

author
Dillon2016 made it!(author)2016-01-13

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

author
sanjeev.saxena.9231 made it!(author)2015-12-14

Can we have video with narrations in English please.

author
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.

IMG_20150905_144917671_HDR.jpg
author
Mows made it!(author)2015-07-25

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

author
slatinski made it!(author)2015-01-11

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

author
airton24x7 made it!(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.

author
imperiusPT made it!(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).

author
kalhelou made it!(author)2013-10-01

nice

author
eulerdgraca made it!(author)2013-08-30

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

author
dreiseratops made it!(author)2012-08-26

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

:)

author
dort made it!(author)2012-08-26

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