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Simple Circuit using LED to alert low voltage


  • JensenBreck
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    JensenBreck

    Hello
    I’m wanting to use this circuit in a small, 2 battery, AA powered vacuum.
    I want it to light the LED when the combined battery power of both batteries drops below (approx) 2.5v
    The problem is, this circuit is set up for a minimum of 6volts. It seems that all I need to do is use a higher value resistor for R3 but I’m not sure and what resistance.

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