Infrared Remote Controller

Infrared remote controller in this website is second infrared (IR) based project used readily available components. As in previous infrared (IR) remote controller also comprises the transmitter and receiver sections. The range of the transmitter can be increased up to 5 meter by using convex lens.

Circuit Description of infrared (IR) remote controller

Transmitter section: - The transmitter circuit of infrared (IR) remote controller is built around IC 741 (IC1) wired as frequency square wave oscillator. Gate pulse from pin no 6 of IC1 is given to gate of SCR1 to drive IR LED1. Variable resistor VR1 is used to vary the generated frequencies.

Receiver Section: - The receiver circuit of infrared (IR) remote controller consist an IC 741, photo transistor (T1) and medium power transistor (T2).

Photo transistor receives the transmitted signal and given to pin 2 of IC2 for amplification. The amplified output from pin 6 of IC2 is given to base of relay driver transistor (T2) through non-polarized capacitor C5, diode D1 and resistor R8. Variable resistor VR1 is used to match the transmitting and receiving signal.

simple and verified remote controller switch


Resistors (all ¼-watt, ± 5% Carbon)

R1,R2 = 100 KΩ

R3, R5, R8 = 1 KΩ

R4 = 15 Ω

R6 = 22 KΩ

R7 = 10 MΩ

VR1 = 1 MΩ

VR2 = 2.2 MΩ


C1, C3, C4 = 0.1 µF

C2 = 1 µF/100V

C5 = 2.2 µF/16V


IC1, IC2 = 741

SCR1 = SN050

T1 = photo transistor

T2 = SL100

D1, D2 = 1N4001


RL1 = 15V, 500Ω Relay




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