Stereo preamplifier TDA3410 (CB21937E)

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

Strength Test (CB16721E)
In this game, whoever tightens the sensors, which are metal bars or spent batteries, makes the...
One Transistor Mixer Preamplifier (CB871E)
This two input simple mixer uses two transistor and can b e upgraded to more inputs. Input...
Sound Level Indicator (CB10649E)
This circuit is from a 1987 American publication called Electronics Handbook. The circuit can be...