Stereo preamplifier TDA3410 (CB21937E)

Taken from the 1982 SGS manual on integrated circuits, this preamplifier was used in commercial equipment at the time.

Intermittent buzzer (CB20494E)
This two-tone buzzer can be powered by a solar panel. The circuit is from a 1991 documentation. The...
Audio Oscillator (CB22250E)
This blocking oscillator was found in a publication from the 50's. The coils determine the...
20W amplifier per channel with the TPA3100D2 (Cb23591E)
The TPA3100D2 integrated circuit from Texas Instruments (www.ti.com) consists of an efficient...