Alarm circuit diagram using op amp

Published:2012/10/25 21:29:00 Author:Ecco | Keyword: Alarm , op amp | From:SeekIC

A1 and A2 form the two-stage amplifier which can amplifer output signal of pyroelectric sensor IRA-E006SX to a desired level. A3 is a comparator, and RP adds reference voltage to the inverting input terminal of A3, whe A2 output level is higher than the reference voltage, A3 outputs a high level to make VT1 conduction, relay κ action to drive the alarm.



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