Wireless Audio Transmission Board Infrared Transmitter & Receiver Module DIY Set

Specification:

DIY kit laser wireless audio transmission module with long transmission distance. Can transmit remote one-way call (duplex intercom need to buy 2 sets of composition) or transmission of mobile phones mp3 and other audio signals, receive audio signals received at the receiving end. The basic principle of using infrared laser to transmit sound is converted from fluctuating sound to red laser, and then the laser vibration signal in the receiver circuit of the photosensitive diode receiver is received, and the signal is demodulated to achieve the sound restoration. The transmission distance can reach 50 to several hundred metres which can be used to make long distance wireless speakers.

1.Parameter:
Input: microphone input or 3.5 audio input (automatic switching)
Function: 1. One-way call telephone (two-way intercom call need to buy 2 sets of composition), 2. mobile phone, mp3 audio transmission.
Transmission distance: recommended 50-hundreds of metres or less, beyond the farther the more unstable signal
Transmitter voltage: 9-12V
PCB size: 19*25mm
Receiver operating voltage: 4~12V
Driver Speaker: 0.5W-10W
Speaker PCB size: 18 * 40mm

2.Circuit Theory:
On the transmitter side: 3.5 headphone port input mobile phone, mp3, computer and other audio signals, or microphone to receive the sound and amplify it, through the transistor S8050 to drive the laser transmitter. transistor S8050 to drive the laser transmitter, the audio signal is sent in the form of a laser line. Receiving end: photosensitive diode Receiver: Photodiode receiver tube for receiving infrared transmitter signals, converted into audio signals through the LM The audio signal is converted into an audio signal which is amplified by the LM386 audio amplifier chip.

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On Dec 4, 2025 at 00:15:44 PST, seller added the following information: