Posted on Apr 24, 2012

Transistor Q1-configured as a source-follower buffer stage, offering a bit under unity voltage gaingives tbe unit a high-impedance input of about 1 MO shunted by about 10 pF, which keeps only minimal loading on tbe equipment being tested. C1 serves as input de blocking capacitor. The Q1 output is coupled hy C2 to a simple AM detector circuit made up of D1, D2, R3 and C3.

Click here to download the full size of the above Circuit.

Capacitor C4 provides output de blocking. Total current consumption should be somewhere around 1 mA. The circuit responds to frequencies from 100 kHz to well over 50 MHz.

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