Light Control Switch Circuit Of Photodiode BPX63

Published:2011/5/1 22:44:00 Author:Christina | Keyword: Photodiode BPX63, Light Control Switch | From:SeekIC

It is improper to use the photoresistor or general photodiode when the light intensity is minimum, and you should use the photodiode BPX63 which has very small cut-off current. In this circuit, light continuously shine on the diode D1, if swich S1 and S2 close, the photocurrent will short circuit, FET T1,T2 and resistor R1,R2 constitute a source emitter follower. When the switch S2 closed, output power of op amp through the field-effect transistor T1 to connect the reverse input port. If swich S1,S2 open, the strong negative feedback circuit will be cut off, however, the work point of the field-effect transistor T2 will be change.



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