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

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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!

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12 Discussions

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koleszar

2 years ago

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!

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sudoukpong

2 years ago

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

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Dillon2016

2 years ago

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

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sanjeev.saxena.9231

2 years ago

Can we have video with narrations in English please.

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Mows

3 years ago on Introduction

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

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slatinski

3 years ago on Introduction

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

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airton24x7

4 years ago

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.

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imperiusPT

4 years ago on Introduction

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).

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eulerdgraca

5 years ago on Introduction

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