How to build Infa-Red Remote Control

Description

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.

Circuit diagram For Transmitter

Circuit diagram For 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 or 2N3904
• Q2 2N2907 PNP Silicon Transistor
• Q3 NPN Phototransistor
• D1 1N914 Silicon Diode
• IC1 LM308 Op Amp IC
• IC2 LM567 Tone Decoder
• LED1 Infa-Red LED
• RELAY 6 Volt Relay
• S1 SPST Push Button Switch
• B1 3 Volt Battery or Two 1.5V batteries in series
• MISC Board, Sockets For ICs, Knob For R6, Battery Holder
• RELAY 6 Volt Relay

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.

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