This is a design circuit for the FSK demodulator, that is the electronics device that converts the FSK signal to serial digital signal. To transmit digital serial data we use FSK modulation and to get back the digital data at the receiver, we need to demodulate it. This is the figure of the circuit;
The main component of this circuit is LM565. For mark /space coding, this demodulator circuit uses 2225/2025Hz. This frequency is the answering frequency of BELL 113, 108, and 103 standards. [Circuit diagram source: National Semiconductor Application Notes]
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