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.
The circuit shown in the figure is suggested by AllegroMicro (www.allegromicro.com) and consists of an...
This is a factory setting that appears on many commercial devices and at various points on this...
With its high power and high performance, this power amplifier is ideal for high quality sound...