Hi all, I'm working on a circuit to test LC ferrite antennas. I found the amp output very noisy with the rectifying diode in the circuit. I can hear the noise and measure it on my meter. Very little noise without the diode. See the link below for a block drawing of the circuit with and without the diode.
Is it simply the diode noise, or something else?
Thanks, Mikek
PS, while receiving a local station, with a tuned LC driving the input, I can get 2v on the meter, although it is over driving the LM386.