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General Purpose Alarm Circuit for Resistive Sensor (3N81)

2014-11-20 00:09  
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When the resistance value of a temperature, light, pressure,? or any other resistive sensors? Rs drops below a certain point? (adjusted by a preset potentiometer),? the SCR (silicon controlled switch) will be triggered. The sensor (Rs) and the potentiometer placement can be interchanged to get opposite action, where the SCR need to be triggered? at the increase of sensing resistor (Rs). Here is the schematic diagram of? the circuit:


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