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.
Found in an Elektor from the 90s, this circuit is based on components that are still common today....
Used in audio circuits in the excitation of output stages, this circuit provides audio signals with...
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...