This simple step of low power audio is from a 1975 documentation. The transistor can be a BC548, and the transformer of the type found in small transistor radios and recorders of the time.
This circuit was obtained in an Electronque Loisirs magazine from France, in a July 1991 edition. It...
This circuit is from the 1977 RCA Linear Integrated Circuits Manual. The circuit has a...
The circuit shown in the figure has a more efficient action, with an attenuation of 12 dB per...