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

Parts:

R1____________22K 1/4W Resistor
R2____________1 Meg 1/4W Resistor
R3____________1K 1/4W Resistor
R4,R5_________100K 1/4W Resistor
R6____________50K Pot
C1,C2_________0.01uF 16V Ceramic Disk Capacitor
C3____________100pF 16V Ceramic Disk Capacitor
C4____________0.047uF 16V Ceramic Disk Capacitor
C5____________0.1uF 16V Ceramic Disk Capacitor
C6____________3.3uF 16V Electrolytic Capacitor
C7____________1.5uF 16V Electrolytic Capacitor
Q1____________2N2222 NPN Silicon Transistor
Q2____________2N2907 PNP Silicon Transistor
Q3____________NPN Phototransistor
D1____________1N914 Silicon Diode
IC1____________LM308 Op Amp IC
IC2____________567 Tone Decoder
LED1__________Infa-Red LED
RELAY_________6 Volt Relay
S1_____________SPST Push Button Switch
B1_____________3 Volt Battery
MISC.__________Board, Sockets For ICs, Knob For R6

Notes:

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.