Sensitive envelope detector circuit diagram

Posted on Feb 6, 2014

This is a very sensitive envelope detector for AM radio. The circuit (see Fig. 1) provides linear detection of weak signals with modulation depth of 80. 85% The first stage (VT1) is a common-emitter amplifier circuit for input signals, the second stage is an emitter-follower circuit (VT2). The transistor VT2 operates at low current because of the hi

Sensitive envelope detector circuit diagram
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gh resistance of the resistor R5. The process of AM demodulation occurs at the lower bend of the volt-ampere curve. A high linearity of demodulation provided by the deep negative feedback in the emitter-follower circuit.

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