Infrared Headphones Circuit Schematic Diagram
Simple Electronic Applications May 19th, 2010This project can be developed for those who need to establish connection between television and headphones without using wire, but using infrared light. The infrared light is used to transmit audio signals from the television to your headphones. This circuit could cover up to 6 meters. If lenses and reflectors with IR sensors is used, the range can be extended.
Infrared headphones circuit schematic diagram (click to enlarge)
To drive the two series-connected IR LEDs, the infrared transmitter uses two-stages transistors. An audio output transformer is used in reverse to couple the audio output from the television to infrared transmitter. The transistors T1 and T2 amplify the audio signals received from the television via audio transformer. Low-impedance output windings which uses lower gauge or thicker wires are used for connection to TV side while high-impedance windings are connected to the infrared transmitter. The Red LED1 functions as a zener diode (0.65V) as well as indicator for supply-end. It uses power a 9V mains adapter or battery.
The infrared receiver uses 3-stage transistor amplifier. Both T4 and T5 form audio signal amplifier. T6 is used to drive the headphone. For maximum clarity, the potentiometer VR2 can also be adjusted. For portable operation, a 9-volt battery can be used.
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July 21st, 2010 at 11:38 am
sir\madam i thank you for this ckt diagram and explanion iam doing a mini project the major problem is this ckt DOSENT MENTION TRANSFORMER RATING also i would like to know to implement this ckt for an ipod what is the rating and ckt components . plz inform as iam desperate to know
September 15th, 2010 at 9:45 am
its one of the easy way of understanding
October 20th, 2010 at 2:31 pm
i have tried out the circuit but this does not work.
the ir intensity is not being modulated moreover i’m not sure whether or not the transformer i’m using is apt.
i tried tracking the signal but what i obsereved was that the signal was reduced to very low voltages after t1.
if anyone has any tweaks or corrections please help.
October 21st, 2010 at 6:20 pm
hi friends,,i am sure that above circuit doesn’t function,,since the transformer rating is unclear and also in the transmitter part,the transistor T1 doesn’t have biasing volatges,,kindly drop the idea of making the above circuit….it’s waste of time
October 29th, 2010 at 2:45 am
plz can u tell me what is the rating of transformer and also i want to know that is photo transistor can be purchased just by saying the name or i have to tell the rating.
what is the diffrence between IR led and a normal led.
plz reply to me i need it urgently
October 30th, 2010 at 4:10 pm
wireless headhones are really the best, i really hate those lengthy cables of conventional headphones .
December 6th, 2010 at 5:21 am
Dear Sir,
I want to connect my computer audio output to my amplifier without using wire means I want a stereo wireless circuit to play the audio through amplifier
Regards
prasad
July 22nd, 2011 at 12:05 am
plz can u tell me what is the rating of transformer and also i want to know that is photo transistor can be purchased just by saying the name or i have to tell the rating.
what is the diffrence between IR led and a normal led.
plz reply to me i need it urgently