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  1. #1
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    How to use uln2803 driver to start relay in proteus

    See the circuit. I want to drive uln2803 with 5 volt signal on 1b input, The Vcc is 12 volt. But he 1C ouptut is two low to drive the relay.

    •   Alt31st May 2010, 18:47

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  2. #2
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    Re: How to use uln2803 driver to start relay in proteus

    Some suggestions about your schematic design :
    Use ULN2803 output in open colector configuration.


    Replace the LED with your relay.



    •   Alt31st May 2010, 19:31

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  3. #3
    Newbie level 5
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    Re: How to use uln2803 driver to start relay in proteus

    Can you upload the schematic file. Because as you suggested in the snap the circuit is not working



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