There is no wire will be used in this circuit between the TV and headphone instead of wires we are using the invisible infrared light for the transmission of audio from the TV going to headphone. The range that can be covered can reach up to 6 meters without using any lens but if required, the range can be made to extend with the use of lenses and reflectors with transmitters and receivers that comprise the IR sensors.
Two series connected IR LEDS are being driven by the two-stage transmitter amplifier that uses the IR transmitter. The audio output from TV to the IR transmitter is coupled by using an audio output transformer that is reversely connected. The audio signals are amplified by the transistors BC547 & BD140. These audio signals are received from TV through the low output impedance windings for TV connection of the audio transformer while high impedance for IR transmitter connection.
A 9V source can power the IR transmitter with the LED functioning as power-on indicator.
Circuit Diagram of Transmitter:
Circuit Diagram of Receiver:
0 comments:
Post a Comment