Infrared transmitter
The one-transistor infrared (IR) transmitter circuit operates by modulating the audio signal onto an infrared light beam, allowing for wireless transmission of sound. The core component of this circuit is a single transistor, which serves as the main amplification and modulation element.
The circuit typically includes a few key components: a transistor (such as the 2N3904), an IR LED for transmitting the modulated signal, a resistor to limit the current through the LED, and capacitors to filter the power supply and stabilize the operation. The audio source is connected to the base of the transistor, which modulates the current flowing through the IR LED according to the audio signal.
When the audio signal is applied, the transistor switches on and off rapidly, causing the IR LED to emit pulses of infrared light that correspond to the audio waveform. The IR light can then be received by an appropriate IR receiver, which demodulates the signal back into audio, allowing for playback through speakers or headphones.
This circuit is particularly advantageous for its simplicity and low component count, making it accessible for hobbyists and educational projects. It is suitable for applications where short-range wireless audio transmission is required, such as in remote control systems or basic wireless audio setups.The ultra-simple one-transistor, IR transmitter shown is designed to transmit the sound from any 8 or 16 ohm audio source, such as a TV, radio, or tape recorder on an infrared beam of light. Easy to make it! 🔗 External reference
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