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infrared IR Remote Extender circuit

2017-08-16 05:07  
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This IR remote extender can increase the range of most simple IR remotes (those operating on a 40KHz modulation) a significant distance. In use, the remote is pointed toward the detector on the circuit, and a button is pressed. The Sharp IR detector then decodes the 40KHz modulated signal into a series of pulses, which trigger a 555 timer. The 555 outputs pulses which are re-modulated and used to drive an IR LED. The circuit is excellent for use in a large room like a presentation hall where a typical IR remote is a bit weak. By extending the wires to the output LED (using shielded cable) you can control a device where line of sight isn't available (such as a wall full of TVs in another room).This circuit can be used to operate a VCR or CD player from another room. It`s really an infrared signal repeater. The signal from the remote is received and then retransmitted over wires to an infrared LED. The beam from the LED is then picked up by the receiving window on the VCR or CD player. The visible light  LED  (LED1) in series with the IR unit (LED2) is used to indicate that the transmitted signal has been detected. The 100-KOhmhm trimmer potentiometer (RI) adjusts the repeater`s sensitivity. The resistor that is usually found in series with the LEDs is omitted, because the voltage reading is about 1.0 Vdc as a result of the voltage drop across the lines.
 

Ir Remote Extender