⭐The Modulator :-
Simple PSK modulation implemented using relay. Still, works like IC 4051 MUX/DeMUX
⭐ The Demodulator :-
The opamp in the center is an adder that cancels out the 180° phase shifted carrier... The output is that of an ASK modulator. The last opamp is now just an ASK demodulator!
⭐ Working :-
Here, depending on the data bit (either 1 or 0), the carrier is transmitted or the 180° phase-shifted version of the same carrier is transmitted.
⭐ Legend :-
Yellow : Adder Output
Purple : Bit input, 1 or 0
Red : Input signal, either c(t) or -c(t).
Green : Final Output
