On 2.4.15 17:10, amdx wrote:
I'm about to build this circuit to compare output from different
ferrite receive antennas. I will be using it with the the FET amplifier
referenced at the bottom of the page, so the input impedance is not a
concern. I'm mostly interested in the DC output to monitor signal
levels. AM band frequencies.

http://www.crystal-radio.eu/diodedet...dedetector.htm

Any fix for the sinewave distortion in the second and third scope traces.
Mikek


If you really need to measure a wide range of input signals,
get a logarithmic amplifier-detector chip, like AD8307.
There are good examples in the data sheet.

You may need a tuned circuit at the input to pick your frequency
of interest.

--

Tauno Voipio