This transistor amplifier was published in Radio Electronics magazine in July 1965. It used newly released silicon transistors with excellent sound quality.
This circuit was found in the 1977 National Semiconductor FET Databook. The FET can be the BF245...
This circuit was found in an old French documentation, but it is current if we use the BC547 for...
We found this circuit, quite common in technical publications, in a 1978 documentation. The...