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Date: 03/22/02 at 1:22 PM
Posted by: Russ Kincaid
E-mail: russlk@yahoo.com

In Reply to: need help to design a circuit posted by Jerry L on 03/20/02 at 5:32 PM:

The wide current range is a problem. A resistor that will produce a sense voltage at 5mA will have excessive drop at 15 Amps. A resistor in parallel with a schotkey diode would limit the voltage drop to 1/2 volt. Use an LM311 comparitor to operate a buzzer using the 9.6 volt battery as power source. A high resistance voltage divider will turn the LM311 on when current flow through the diode stops.

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