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Circuits designed by David Johnson, P.E.

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Last Updated on:  06/18/2009 04:42:49 AM

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Acceptable Voltage Indicator
I have used this circuit many times in custom test fixtures where a simple go-no go indication was needed.  The circuit can also be used to adjust a particular voltage be within specific high or low limits.  The three LEDs will indicate if the voltage is high, low or OK.  When connected to other converters, such as a frequency to voltage converter, a current to voltage converter or a power to voltage meter, it could provide a quick indication of a proper level.

Circuit Acceptable Voltage Indicator designed by David Johnson, P.E.

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