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Author Topic: FET Infinite impedance detector  (Read 1479 times)
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WA4WAX
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« on: February 07, 2023, 05:54:57 PM »

A tidbit sent to me on Twitter.

https://baltic-lab.com/2023/02/jfet-based-infinite-impedance-detector-for-am-demodulation/
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W1DAN
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« Reply #1 on: February 10, 2023, 09:09:23 PM »

Hi:

Nice article. Taken from a 1970's ARRL Handbook I used an infinite impedance detector using an MPF102 in an HRO I solid-stated. Worked fabulously, and I enjoyed hearing the different sound qualities of the tropical shortwave transmitters at 5MHz.

Funny no one else is interested in this simple circuit.

Dan
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K9MB
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« Reply #2 on: February 12, 2023, 08:31:48 PM »

Hi:

Nice article. Taken from a 1970's ARRL Handbook I used an infinite impedance detector using an MPF102 in an HRO I solid-stated. Worked fabulously, and I enjoyed hearing the different sound qualities of the tropical shortwave transmitters at 5MHz.

Funny no one else is interested in this simple circuit.

Dan

Nice call, Dan.
Here it is on page 229 of the 1972 ARRL Handbook.
Nothing new under the Sun, even the venerable infinite impedance detector adapted to a JFET. New one over 50 now…😉


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