LM565 bassed FSK Demodulator circuit with explanation

A very simple FSK demodulator for (the 2025 Hz and 2225 Hz) electronic project can be designed using the LM565 which is a general purpose phase locked loops IC containing a stable, highly linear voltage controlled oscillator for low distortion FM demodulation, and a double balanced phase detector with good carrier suppression.
The VCO frequency is set with an external resistor and capacitor, and a tuning range of 10:1 can be obtained with the same capacitor.
As you can see in the circuit diagram , this FSK demodulator require extreme few external components .

As we mentioned , this circuit is an FSK demodulator for the 2025 Hz and 2225 Hz , but you can change the parameters , by changing the loop filter components .
LM565 bassed FSK Demodulator circuit with explanation
This demodulator circuit needs to be powered from an external 12 volts DC power supply .
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