This signal injector and tracer (follower) was found in an old American documentation. The transistors can be general use and power is made with one or two common cells.
This simple experimental circuit using only transistor produces a tone given by C1 and C2. Tone is...
The frequency of this oscillator is determined only by the crystal, without the use of tuned...
This S-meter circuit was found in a 1976 publication. The circuit is used to measure the signal...