R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
This circuit is from 1992 documentation. The operational circuit, which is uncommon nowadays, can...
The circuit suggested in the figure differentiates the signal from the negative front of a...
Suitable for the medium wave band with a loop antenna, this receiver was published in Radio...