This circuit can transmit voice over a 1mm plastic cable. The transmitter board (KIT26 T) has a microphone and a line that modulates the LEDs. The LEDs are housed in a plastic case to facilitate connection of the FO cable for transmission. On the receiver (KIT26R) board there are optoelectronic receivers, speakers and circuits for converting the detected optical signals into electrical signals, amplifying and converting them into sound waves. The speech signal is transmitted in the form of light waves in the cable without any influence of electric and magnetic fields. The transmission distance is long and the anti-interference ability is strong. Each board requires a 9V battery, but a rectified power supply is recommended for continuous use. A 4.3 m diameter plastic cable of 1 mm diameter is installed in the device. This line can transmit signals well through the 183m cable. Note: The plastic cable used here is not a 1 μm glass cable, which can be communicated over a greater distance (approximately 32 km) using a glass cable. The application of plastic optical cable is very convenient, and the short-distance communication in the electronic noise environment has obvious anti-interference effect. This circuit is assembled on a single-sided printed circuit board.
How it works: The audio signal is initially a sound wave that is converted to an electrical signal by the transmitter's electronic microphone. This signal is amplified by an audio amplifier consisting of the LM358, and the electrical signal is converted to an optical signal by controlling the terminal voltage of the LED with a separate transistor. The optical signal is sent to the plastic cable. At the other end of the cable, the light signal illuminates the photocell of the receiver. The photocell then converts it into an electrical signal. This signal is amplified and sent to the speaker for conversion to sound waves.
Transmitter component selection: IC1 selects LM358 integrated circuit. VQ1 uses BC547 triode. C1 uses a 0.1μF single capacitor. VD uses IF-E96 photoelectric emitter (blue dot pink dot). Other components are shown in the figure.
Receiver component selection: VT selects IF-D93 photodetector (black dot). C2, C3, CA, and C6 all use 0.1μF monomer capacitors. Other components are shown in the figure.
Transmitter board:
Photoelectric receiver:
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