This traditional circuit generates a 200 Hz sinusoidal signal. The frequency depends on the capacitors and the transistor can be a BC548. We found this circuit in a 1979 documentation.
This circuit, found in the SGS manual of linear integrated circuits of 1982, has a current limiter...
The correct connection of speakers and tweeters in a speaker to obtain better sound quality,...
The TL431 integrated circuit consists of a programmable shunt regulator with an internal...