N9NEO wrote:
There looks like a typo in schematic.

http://www.amwindow.org/tech/htm/alowdisdet.htm

Amplifier inputs have to be swapped at the two rectifiers.

later
NEO

I don't remember any errors, but it has been 8 months since I built one
of these. I will open up my outboard detector and verify the design. It
will
have to wait until Sunday night at the earliest.

Terry