This receiver uses old transistors that are equivalent to BC548 and BC558. The photo diode is of any type. The receiver can be used on a highly sensitive audio link.
This circuit was found in an American publication from the 60's. The transistor is from that...
The purpose of this circuit, which we find in an old American documentation, is to allow the...
This receiver was found in an article in Electronics Now magazine in March 1994. The coils are...