A simple high quality FM remote wireless speaker system can be designed using the LM566 VCO and LM565 PLL Detector . This high quality, noise free, wireless speaker system is composed from two stages : radio transmitter and radio receiver .
The LM566 VCO is used to convert the program material into FM format, which is then transformer coupled to standard power lines. At the receiver end the material is detected from the power lines and demodulated by the LM565.
The complete wireless speaker system is suitable for high-quality transmission of speech or music, and will operate from any AC outlet anywhere on a one-acre home side. Frequency response is 20±20,000 Hz and THD is under 2% for voice and music program material.
The receiver module includes a 2.5W power amplifier to drive a speaker directly.
The input signal level is adjustable by R1 to prevent overmodulation of the carrier.
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