This circuit was found in a Motorola manual from 1968. As it can be obtained 20 V at 15 kHz from 120 V x 60 Hz. The components are of the time.
This two-transistor amplifier can be used as power stage for intercom, experimental receivers,...
This sensitive circuit was found in old English documentation. Transistors may be modern...
This configuration, already presented in other points of this section and website, is of a...