The purpose of this circuit is to silence the hiss that exists between the stations on an FM receiver. The circuit was found in American documentation from the 1980s.
This circuit was found in a Popular Electronics from the 90s. The frequency depends on the...
This circuit consists of a “zero crossing detector” that provides a rectangular output signal...
Low power RF transistors such as the BF494 or BF495 and even those in the BC series can oscillate well...