Digital Signal Processing (DSP)Electronics

Portable Remote Control Home Appliances

Circuit diagram for remote control home appliances

Portable Remote Control Home Appliances

  • To study remote based system.
  • To study the IR Sensor
  • To design the circuit.
  • To built a system for control a lamp.
  • To study the advantages of remote based system
  • To implement the remote control based system in different applications.

List of Components:


TSOP Sensor / IR sensor

IC 555




Resistor & Capacitor

Connecting Wires


Transistors (NPN & PNP)

Power Supply


Circuit diagram for remote control home appliances
Circuit diagram for remote control home appliances


Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 meters. The 38 kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 (BC558).

The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’ The output of IC1 is taken from its pin 2. LED2 (green) connected to pin 2 is used to indicate the ‘on’ state of the appliance. Transistor T2 (BC548) connected to pin 2 of IC1 drives relay RL1. Diode 1N4007 (D1) acts as a freewheeling diode. The appliance to be controlled is connected between the pole of the relay and neutral terminal of mains. It gets connected to live terminal of AC mains via normally opened (N/O) contact when the relay energizes.


  • Control a high-voltage circuit with a low-voltage signal, as in some types of modems or audio amplifiers,
  • Control a high-current circuit with a low-current signal, as in the starter solenoid of an automobile,
  • Detect and isolate faults on transmission and distribution lines by opening and closing circuit breakers (protection relays).

Power Supply

The project requires a regulated 5 volt supply voltage. The power supply circuit converts 230 AC to 5 volts DC and also we connect Relay to operate AC devices like bulb etc.

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