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Null-detector

2014-11-17 00:30  
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In this indicating comparator circuit, R2 sets the hysteresis. If the 741 saturates at ± 12 V, the current in R1 will be approximately ± 10 mA if 0.1 V hysteresis is desired. Null-detector - schematic
Then 0.1 V/10 mA ~ 100