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4 CH Remote Control without PIC

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Aya2002

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Hi members,

I found a circuit diagram on the net in the following link :

https://www.guidecircuit.com/Circuit-remote-control-4ch-remote-control.htm

i understand some thing from it but not all. In fact i need to understand its operation as how the shift register will receive the input data and how the binary counter will work as a result, what is the shape of the output waveform will be?

my second question is how the Receiver will decode the received signal to produce the output.

also i need to know, is the modulation will be carried out by the transistor (BC 640)? if so, where is the demodulation in the receiver circuit diagram?

thanks
 

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