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Monday, August 24, 2009

Simple Car Battery Charger


This very simple circuit uses a transformer ,two diodes , a capacitor and an ammeter.To charge a battery just connect the + and - terminals of the circuit to the corresponding terminals of the battery.When the battery is not charged, the ammeter reading shows 1-3 amps.When the battery is fully charged the ammeter reads Zero or nearly zero, after which the battery should be removed from the charger.

http://www.electronic-circuits-diagrams.com/psimages/7.gif


The circuit is a full wave rectifier using 2 diodes for rectification. The capacitor is used for smoothing.I think the circuit works fine without the capacitor since the battery itself acts a BIG capacitor. But when you are using thecircuit to supply 12V (as a battery eliminator) the capacitor needs to be present.Care should be taken NOT to reverse the + and - terminals while connecting it to the battery.

3 comments:

kavi said...

How can i use a 3A transformer with out center tap ?

can we use it with out center tap

Zam said...

That is a good question actually you cant do so....Then use a transformer with center tap.

Guria Qazi said...

thanks for providing detailed information of circuits working,A very easy way to prolong the life of your Car Batteryis to keep it clean. Most of the time you
can simply use a soft rag to wipe it down, but if it has become grimy you may need to use a mild
detergent.

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