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  1. #1
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    Batery charger problem.

    I built this automatic battery charger circuit http://www.elecdesign.com/Articles/I...ArticleID=1823

    But it is not working properly. When the battery voltage reaches any of the threshold value, relay start chattering heavily. I tried to put 0.1uF capacitor between base of transistor and ground but it did no help. Can anyone please suggest me a work around for this?

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  2. #2
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    Re: Batery charger problem.

    Make sure you have the NO contact wired as in the circuit. This provides +ve feedback by shorting out VR1 the moment the relay switches to stop the charging cycle. Shorting out VR1 turns the transistor on more to prevent chattering.

    E



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  3. #3
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    Re: Batery charger problem.

    I have checked it and it is wired correctly. Relay is still chattering. :(



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  4. #4
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    Re: Batery charger problem.

    Pls check your relay , did you use 12 volts relay ?



  5. #5
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    Re: Batery charger problem.

    Yes I am using 12V relay.



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  6. #6
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    Re: Batery charger problem.

    Try to install electrolytic capacitor across relay ( D1 diode ) say with a value of 4.7 to 10 microfarad or try to use another relay as well. :o



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