Simple IR audio link


Posted on Feb 5, 2014

Here is a simple IR audio link that can be used to transmit audio signals up to 4 meters. The signal to be transmitted is applied to the base of Q1 via resistor R4. The transistor Q1 drives the IR transmitting diodes D1 and D2. The audio input will be modulated to the IR signals transmitted. The transmitted IR signals will be picked by the photo tra


Simple IR audio link
Click here to download the full size of the above Circuit.

nsistor Q2. The emitter voltage of the transistor Q2 will change according to the sound modulated to the IR signal. The transistors Q3 and Q4 amplifies this signal to drive the speaker or headphone. C1 and R3 forms a filter to avoid interference from stray IR signals.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Radio Glen TBU
    Low-Ohms Adapter
    Automatic lamp dimmer circuit
    Intercom Circuit
    Frequency Modulator and Tuning Circuit
    wireless temperature sensor
    Sound Effects Alarm Generator
    RC filters-operation-circuit-diagram
    Cortex M3 MCU features USB firmware protection
    TEA5551T AM radio receiver circuit design electronic project
    Power Supplies
    Motorola TPN1154 and TPN1136 Desktop Power Supplies



    Top