This circuit is from a 1965 Electronic Design. The transistors may be general purpose and the power supply must be symmetrical.
This amplifier uses hybrid modules Sanken and can provide powers of 10 W or 20, depending on the...
This circuit was suggested by Signetics in 1980s documentation. The circuit makes use of the...
The drive levels of this shield are opposite to the previous one. The photo-transistor can be of...