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  1. #1
    Newbie level 1
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    uln2803 relay

    Hi, anyone can help me how to use ULN2803 to drive Relay.
    I use ULN2803A and my coil relay is 12VDC. COM on the pin no 9 should be connected to 12v or 5v? and ULN2803 doesn't have VCC pin.

    Please help me if possible in a diagram.
    thx

    •   Alt16th August 2009, 10:36

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  2. #2
    Advanced Member level 5
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    blueroomelectronics's Avatar
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    drive relay

    Google is handy



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