General Purpose Alarm Circuit for Resistive Sensor circuit

Published:2013/3/29 4:35:00 Author:Ecco | Keyword: General Purpose Alarm , Resistive Sensor | From:SeekIC

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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