Electronic Projects for Light Operated Switch (With LDR) Using OP - Amp (741)

A light operated swiitch can be made with the Op-Amp IC 741. LDR is used  here as the light sensitive device and Op - Amp is used in its inverting mode. we can add any thpe of load in series with the relay.

Circuit For Light Operated Switch (With LDR) Using OP - Amp (741)



Part List
IC 741
Transistor : SL 100 OR BC 1488
Diode : OA 79, Reply 400 E,9V
Resistance : 1k,10K 2no,VR 470k, 2.2k, 330 Ohm's,
LDR : 1 No
DPDT Switch
Capacitor : 1MF/30V