ASK DEMODULATOR

161

01:13:06

  
It is the circuit diagram of asynchronous ASK detector 
 
ASK is generated using a sine carrier and a switch which represents 1 and 0 bits (on and off positions of switch). 
Why does it crashes after disconnecting the carrier using switch? 
http://everycircuit.com/circuit/5769418308059136 
 
In the circuit R1, R2 and �A741 comprise an inverting amplifier to amplify the input signal. 
Then D1 is the rectifying diode to make the modulation signal passes through D1 half wave rectifier. 
 R3 and C1 comprise a low-pass filter. 
�A741, VR1 , D2, R4 and C2 comprise a comparator, therefore, the output terminal can demodulate the digital demodulated signal. 
 
ASK is generated using a sine carrier and a switch which represents 1 and 0 bits (on and off positions of switch). 
Why does it crashes after disconnecting the carrier using switch?﻿

published 9 years ago

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