With the circuit shown, you can turn the lamp on or off in the living room, without the need to leave the sofa, which is very good for those who are watching TV. This is the purpose of the circuit presented. It is an infrared remote control. When the sensor (L1 - photodiode) receives the signal coming from the transmitter, it is amplified by the CI-741 which delivers a low level based on Q1, which was in the driving state. This will cause him to go to the cut and Q2 to drive and thus the CF-2 input will receive a low level. The output of this CI goes to the low level, activating the load through an MOC3010 optocoupler. This load can have up to 100 W. The source that supplies the circuit is of the type without a transformer, taking advantage of the reactance of a capacitor. For this reason, great care must be taken when handling the circuit that is not isolated from the power grid. A 12 V x 5 W 1N5349 zener is used to stabilize the voltage at 12 V.
