Infa-Red Remote Control

I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations.

Schematic For Transmitter
This is the schematic of the IR Transmitter

Schematic For Receiver
This is the schematic for the IR Receiver


Part Total Qty. Description Substitutions
R1 1 22K 1/4W Resistor  
R2 1 1 Meg 1/4W Resistor  
R3 1 1K 1/4W Resistor  
R4, R5 2 100K 1/4W Resistor  
R6 1 50K Pot  
C1, C2 2 0.01uF 16V Ceramic Disk Capacitor  
C3 1 100pF 16V Ceramic Disk Capacitor  
C4 1 0.047uF 16V Ceramic Disk Capacitor  
C5 1 0.1uF 16V Ceramic Disk Capacitor  
C6 1 3.3uF 16V Electrolytic Capacitor  
C7 1 1.5uF 16V Electrolytic Capacitor  
Q1 1 2N2222 NPN Silicon Transistor 2N3904
Q2 1 2N2907 PNP Silicon Transistor  
Q3 1 NPN Phototransistor  
D1 1 1N914 Silicon Diode  
IC1 1 LM308 Op Amp IC  
IC2 1 LM567 Tone Decoder  
LED1 1 Infa-Red LED  
RELAY 1 6 Volt Relay  
S1 1 SPST Push Button Switch  
B1 1 3 Volt Battery Two 1.5V batteries in series
MISC 1 Board, Sockets For ICs, Knob For R6, Battery Holder  
RELAY 1 6 Volt Relay  


1. To adjust the circuit, hold down S1 while pointing LED1 at the receiver. Adjust R6 until you hear the relay click.

2. You can increase range by using a high output LED for LED1.

3. Bright light will stop the receiver from responding to the transmitter.

Title: Infa-Red Remote Control
electronic circuit
Published on: 2005-02-03
Reads: 988
Print version: Print version

Other electronic circuits and schematics from Motor, light and power control

Electronic circuits > Motor, light and power control > Infa-Red Remote Control