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Thread: deciding how to power circuits

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  1. 11-01-2012, 04:52 AM #1
    Goosey
    Goosey is offline Registered
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    deciding how to power circuits

    I plan to use a LM339 (quad comparator) to sense the motor current through a UDN2998W (dual bridge). My power supply is 36v. If I use the same power supply to power both ic's and the windings, will I run into any feedback problems?
    Also, if that is feasible, what's the best way to get the right voltages for the chips? I have a 3.6v zener diode that might serve for ref voltage for the comparator.
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  2. 11-01-2012, 10:45 PM #2
    H500
    H500 is offline Gold Member
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    It won't be a problem as long as your PCB is designed properly. However, dropping 36v down to 3.3 is very inefficient. I used separate power power supplies.
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