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                        Voltage Monitor

                        Circuit diagram

                        D1 LED
                        R1 1.2k Resistor
                        R2 10k Var. Resistor
                        U1 UA741 OP AMP

                        When the input voltage is 0 the LED glows. The LED stops glowing when the voltage rises to the level determined by R2. Reverse + and - pins to reverse operating mode. To set voltage at which LED goes off, (1) Set 0V at input. (2) Set input voltage at desired level. (3) Adjust R2 to point right after LED goes out.

                        author:Paul Stilo,
                        website: http://circuitarchive.150m.com/

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