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 is a classic FM amplifier IF amplification stage configuration. The circuit is from a 1980s...
This staircase generator was found in the July 1991 issue of Radio Electronics magazine. Its...
This 80's circuitry decodes stereo signals used in analog TV at the time. The circuit can be used...