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How to build Voltage Monitor

2015-01-23 15:54  
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Circuit diagram

Voltage Monitor-Circuit diagram


D1 LEDR1 1.2k ResistorR2 10k Var. ResistorU1 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.

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