Schematic Volt

A very simple device allowing a quick check of common Infra-red Remote-Controls can be useful to the electronics amateur, frequently asked to repair or test these ubiquitous devices. A reliable circuit was designed with a handful of components: the LED will flash when any of the Remote-Control push buttons will be pressed. The side of the Remote-Control bearing the IR emitting diode(s) must be directed towards the Photo Transistor (Q1) of the checker circuit: maximum distance should not exceed about 20 - 25cm.

Parts:
R1 = 470K
R2 = 47R
D1 = LED Any Type
Q1 = Photo Transistor
Q2 = BC327
B1 = 3V Battery or 2 AA cell
Notes:

• Current drawing of the circuit is less than 1mA when the LED illuminates and 0mA when no signal is picked-up by the Photo Transistor: therefore, SW1 can be omitted.
• SW1 will be SPST Toggle or Slider Switch

Using this low cost Project individual can produce AUDIO from tube with no worrying a person. It does not application some wire relating television and headset. all the rage place of couple of wires it uses imaginary Infrared light to transmit audio signals from small screen to earphone. lacking using several lens a range of up to 6 meters is promising. Range can survive extended by using Lenses and Reflectors with IR sensors comprising transmitters and receivers. IR transmitter uses two-stage transistor amplifier to drive two IR leds connected dressed in succession. An audio output transformer is used (in reverse) to pair Audio output from television to the IR transmitter.