need circuit

how will control home appliances by IR remote controller? need simple circuit diagram with components details.

Do your homework!

You might build a simple circuit based on an IR sensor such as the part 276-1640 from Radio Shack or the part 751-1390-5-ND from Digi-Key. Both parts detect a 38Khz modulated IR light and then transition their logic from low to high. On the transmit side you use a simple solution such as a simple 555 modulated at 38Khz to activate the IR sensor circuit.

If that does not work, like the earlier guy said...you will need to do your homework.

One more thing.....U will need to do some kind of signal conditioning on the receive side and gate the response such that a pulse from your source turns on your circuit and then a second pulse will power it down. Probably a one shot aagn using a 555 or TI part and then a simple T-FlipFlop using the output from your one-shot as the clock to the T-FlipFlop that will force the output to toggle from off to on.....

it depends that how many apliances you want to control, for single channel(one appliance)try the circuit below, and for multi channel u can use microcontroller

Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan or the tubelight. Here is a simple circuit to remotely switch on/off any electrical device through a relay using the normal TV/VCR/VCP/VCD remote control unit. It works up to a distance of about 10 metres. The circuit is built around a 3-pin IR IC receiver (Siemens SFH-506-38 or equivalent) that can detect 38kHz burst frequency generated by a TV remote. (This IR receiver module has been covered earlier in many projects published in this blog.) The output pin of IR sensor goes low when it detects IR light, triggering the monostable (1-second) built around timer NE555. The output of the mono toggles the J-K flip flop, whose Q output drives the relay through SL100 npn transistor (T1).


LED2, LED3, and LED4 are used to display the status of each output stage during circuit operation. Back-EMF diode D5 is used for protection. Transistor T1 is configured as an open-collector output device to drive the relay rated at 12V DC. The circuit draws the power from voltage regulator 7805. Capacitor C5 is soldered close to the IR sensor’s pins to avoid noise and false triggering. Capacitor C3 and resistor R3 also avoid false triggering of monostable NE555. The monostable acts as a 1-second hysterisis unit to restrict the flip-flop from getting retriggered within one second. To activate any other 12V logic device, use the output across the relay coil terminals.