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Car battery charger (BC546)

2016-05-11 07:48  
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This article describes the Car battery charger (BC546). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: BC546.

This charger will quickly and easily charge most any lead
acid battery. The charger delivers full current until the current
drawn by the battery falls to 150 mA. At this time, a lower
voltage is applied to finish off and keep from over charging.
When the battery is fully charged, the circuit switches off
and lights a LED, telling you that the cycle has finished.

Schematic

Parts

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Notes

The circuit was meant to be powered by a power supply, which
is why there is no transformer, rectifier, or filter capacitors
on the schematic. There is no reason why you cannot add
these.

A heatsink will be needed for U1.

To use the circuit, hook it up to a power supply/plug it in.
Then, connect the battery to be charged to the output terminals.
All you have to do now is push S1 (the “Start” switch), and
wait for the circuit to finish.

If you want to use the charger without having to provide an external power supply, use the following circuit.

The first time you use the circuit, you should check up on it
every once and a while to make sure that it is working properly
and the battery is not being over charged.

 


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