The circuit is of the Motorola Linear Databook of 1990. The power source must be symmetrical and the characteristics of the circuit are given next to the diagram.
This ultra-simple 9 V power source was obtained in an Argentine publication of the 1970s, but it...
We found this filter in the 1990 Motorola Linear Databook, but it can be implemented with other...
The AC125 transistor is an ancient germanium type widely used in audio stages as a preamplifier. In the...