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Monday, August 16, 2010

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

Part
Total Qty.
Description
Substitutions
R1122K 1/4W Resistor
R211 Meg 1/4W Resistor
R311K 1/4W Resistor
R4, R52100K 1/4W Resistor
R6150K Pot
C1, C220.01uF 16V Ceramic Disk Capacitor
C31100pF 16V Ceramic Disk Capacitor
C410.047uF 16V Ceramic Disk Capacitor
C510.1uF 16V Ceramic Disk Capacitor
C613.3uF 16V Electrolytic Capacitor
C711.5uF 16V Electrolytic Capacitor
Q112N2222 NPN Silicon Transistor2N3904
Q212N2907 PNP Silicon Transistor
Q31NPN Phototransistor
D111N914 Silicon Diode
IC11LM308 Op Amp IC
IC21LM567 Tone Decoder
LED11Infa-Red LED
RELAY16 Volt Relay
S11SPST Push Button Switch
B113 Volt BatteryTwo 1.5V batteries in series
MISC1Board, Sockets For ICs, Knob For R6, Battery Holder
RELAY16 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.
  4. There is an error in the schematic. There shuold be a 1 megaohm resistor between pin 3 of IC1 and ground. This provides a 0 volt reference to bias the IC.

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