25-03-2017, 01:13 PM
Connect this circuit to any of your appliances (lamp, fan, radio, etc.) so that the device turns on / off from a TV, VCD or DVD. The circuit can be activated up to 10 meters. The infrared (IR) 38kHz generated by the remote control is received by the 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 the clock pin 14 of the decade counter IC CD4017 (IC1). Pin 8 of IC1 is connected to ground, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the device is off. ) Connected to pin 2 is used to indicate the power status of the appliance. The transistor T2 (BC548) connected to pin 2 of the IC1 transmits the relay RL1. Diode 1N4007 (D1) acts as a freewheel diode. The device to be controlled is connected between the relay pole and the neutral terminal of the network. It is connected to the active terminal of the AC network through the normally open contact (N / O) when the relay is energized.
The amplified signal is fed to the clock pin 14 of the decade counter IC CD4017 (IC1). Pin 8 of IC1 is connected to ground, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the device is off. ) Connected to pin 2 is used to indicate the power status of the appliance. The transistor T2 (BC548) connected to pin 2 of the IC1 transmits the relay RL1. Diode 1N4007 (D1) acts as a freewheel diode. The device to be controlled is connected between the relay pole and the neutral terminal of the network. It is connected to the active terminal of the AC network through the normally open contact (N / O) when the relay is energized.
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