Wednesday 4 December 2013

A VERY SIMPLE IR REMOTE CONTROL SWITCH FOR AN ELECTRICAL APPLIANCE


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 metres.
The 38kHz 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 (pnp).
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 energises.

1):- IR REMOTE CONTROL USING CD4017


COMPONENT LIST:-
R1,R2 - 330ohms
R3 -       220K
R4 -       1k
R5 -       47ohms
C1 -      100uf/16v
C2 -      0.1u
T1  -      bc558
T2  -      bc548
D1-      1N4007
IC1-      CD4017
SENSOR-        TSOP1738
RELAY-            5V/100ohms
LED-                RED,GREEN
ONE ANY TYPE REMOTE

WITHOUT RELAY YOU CAN CONVERT 220V TO 5V  BY TRANFORMER
The power supply for the circuit can be derived from the mains AC itself using a step down
transformer and a bridge-rectifier circuit. For +5V power supply, the LM7805 regulator IC can 
be used as shown below:-

 ONE ANOTHER CIRCUIT  SAME BUT COMPONENTS ARE DIFFERENT
COMPONENT LIST:-
R1,         -100K
R2              -1K
R3,R4     -4.7K
 R5        -100R  
C1-        10UF
D1   -1N4148
T1     -BC547
T2     -BC557
IC  -CD4017
               SENSOR-TSOP1738
RELAY   -5V
LED    -RED
                                                                                                                                                           

  3):- IR  REMOTE CONTROL USING IC555                                                                                                                                                     

COMPONENT LIST:-
R1        -1K
R2,R3  -1.2K
R4         -56K
R5         -470ohm
R6         -100ohm
C1         -100UF/25V
C2         -0.1UF
C3         -0.01UF
C4         -1UF/16V
C5         -47UF/16V
C6         -10UF/16V
T1          -BC548
T2          -BC558
D1         -1N4007(4)
RELA Y -5V(2)
IC           -7805
IC           -555
SENSOR-TSOP1738
TRANSFORMER-6-0-6

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