need help with 12V car battery charger circuit

Discussion in 'The Projects Forum' started by riduan, Aug 18, 2009.

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  1. riduan

    Thread Starter New Member

    Aug 17, 2009
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    http://users.otenet.gr/~athsam/car_12v_battery_charger.htm

    On reference to the link above, my group and i were to patch up the circuit and then test the charger. We did it without the transformer and the bridge rectifier. We directly connect the input to a 17Vdc power supply. But it did not work properly. The circuit can charge the 12V battery but it did not cut off once it is fully charged. The red led did not flicker as the battery is charging and did not light up once it is fully charged. We set the trimmer to null value at first, we follow the steps as we go along but still did not work properly. We try troubleshooting over and over but still could not find a solution. Can anyone help us with this? Do we need to modify the circuit? Do we need to change some of the components used? Would really appreciate the help.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Last edited: Aug 18, 2009
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