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Infrared Wireless Headphone Circuit

Anyone can make its own wireless headphones using this Infrared Wireless Headphone Circuit.

It sends sound by using infrared light but not with wire.

So we can move around easily while listening.

We can also control it from far like change volume or songs.

What is a Infrared Headphones Receiver Circuit:

Main job of infrared (IR) headphones receiver circuit is to get wireless audio signal sent by infrared light.

Infrared headphones are with no wire headphones.

They get sound from TV or music system using infrared.

Receiver circuit is very important as it catches the signal and change it back to sound where we can hear.

Circuit Working:

Parts List:

CategoryDescriptionQuantity
Resistors( All resistors are 1/4 watt)470k1
820k1
560Ω1
Preset 100k1
CapacitorsCeramic 10nF1
Electrolytic 47μF 16V2
Electrolytic 22μF 16V2
SemiconductorsTransistor BS1701
IR receiver LED BP1041
Headphone1
Battery 9V1

Use both IR headphones transmitter and IR headphones receiver.

Choose headphones with 600 ohm impedance.

BPW41N and BP104 have light filter that focus at 950 nm when temperature is 25°C.

This IR receiver idea is simple so little sound distortion (1% to 2%) happens at 3 to 4 meter distance in normal light then that is okay.

How to Build:

To build a Infrared Wireless Headphone Circuit following are the below mentioned steps to be followed:

Find the Parts:

Make the Circuit:

Put Circuit Together:

Connect IR Transmitter:

Power Source:

Test the Circuit:

Fix and Improve:

Final Test:

Keep Record:

What is a Infrared Headphones Transmitter Circuit:

Infrared headphones transmitter circuit uses electricity to send sound without wire to IR headphones.

This transmitter circuit is an important part which sends sound from source to headphones using infrared light.

Circuit Working:

Parts list:

CategoryDescriptionQuantity
Resistors( All resistors are 1/4 watt)100k1
82k1
6.8Ω1
Preset 100k1
CapacitorsElectrolytic 220μF 16V1
Ceramic 100nF1
SemiconductorsTransistor BC5472
Transistor BS1702
IR transmitter LED LD2713
Battery 9V1

Transmitter help headphones connect using light from infrared.

Three IR LEDs get power from transistor T1 which we can adjust current with preset P1.

When using 9V power this IR transmitter takes around 60mA current.

Keep adapter ground away from audio signal ground, so no bad current goes through LEDs.

Put LEDs in different angles and use reflectors behind them to make light signal better because it goes mostly in one direction.

Best sound input for this transmitter is 100 to 200 mV.

It can work up to 1.2 to 2.4 meter distance.

We also give the IR receiver circuit for this transmitter.

Formula:

This is a common formula to find voltage gain (Av) of FET amplifier:

Av = −gm * RL

where:

gm is transconductance of FET found by:

gm = 2ID / (VGS − Vth)

Why this formula works:

Gm Transconductance:

This show how much output current of FET changes when input voltage of VGS changes.

It tell how strong FET can amplify signal.

RL Load Resistance:

This resistor is at FET output for drain

It affect how much voltage gain we get from amplifier.

How to Build:

To build a Infrared Wireless Headphone Circuit follow the below steps for connections:

Find the Parts:

Make the Circuit:

Build the Circuit:

Connect Audio Input:

Power the Circuit:

Adjustments:

Testing:

Conclusion:

This Infrared Wireless Headphone Circuit gives wireless music and also lets us control audio without wires.

Good for places where people want to move around and still hear sound or control music.

It can be changed based on what we need or what setup we have.

References:

Wireless headphones applications

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