Loss pulse alarm circuit

Published:2011/4/13 21:25:00 Author:Nicole | Keyword: Loss pulse, alarm | From:SeekIC

This circuit is used to test missing light pulse or the shortages of goods in sport transport tape. CA3062 combined photodetector and amplifier, it can test the light pulse which is synchronous with 60Hz power supply frequency. When switch SW1 is in A, each pulse is as 16.7ms interval to reset the 20ms timing network of 2N2646 unijunction transistor, to prevent unijunction transistor from triggering, and to trigger 2N2529 SCR turn on alertor. When SW1 is in B, this circuit interrupts detection steady light beam, the alertor alarms only in the case of without interruption.



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