This circuit was found in a Dutch documentation from 1970. The circuit makes use of semiconductors that have current equivalents and is indicated by a 0-5 mA milliammeter.
One of the first transistor amplifiers with transformerless output but using a 45-ohm speaker. This...
This circuit, which we found in SGS's 1982 linear semiconductor manual, does not need a...
This circuit is from an old documentation but still current for assembly. Just use BC548 instead...