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Build Your Own IR Remote: 2N2222 Circuit Diagram

Description

Numerous emails have been obtained requesting schematics for infrared remote controls. Consequently, one such design is now available. This remote device transmits a signal utilizing an infrared light-emitting diode. This signal is subsequently processed by the receiving unit. Due to the receiver’s activation only occurring upon detection of the transmitted signal, there are no unintended activations.

Circuit Diagram For Transmitter

Infa-Red Remote Control-Circuit diagram For Transmitter

Circuit Diagram For Receiver

Infa-Red Remote Control-Circuit diagram For Receiver

Components:

  • 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 fine-tune the system, depress S1 while aiming LED1 at the receiver. Adjust R6 until you hear the relay activate.
  2. Range can be extended by using a high-powered infrared LED for LED1.
  3. Excessive ambient light will prevent the receiver from responding to the transmitter.
circuit from http://www.aaroncake.net/