Analog Multiplexer (CB21250E)

This low impedance circuit was found in an Electronic Design from the 90's. Operational amplifiers admit equivalents.

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Car voltage tester (CB22127E)
This simple circuit indicates whether at a point in the wiring of a car 12 V is present. The clip...
Digital Mixer (CB212E)
A stereo digital mixer using the 4053 is built as shown in figure bellow. The IC must be powered...
Treble Cut Filter (CB15198E)
We found this circuit in the 1982 SGS Linear Integrated Circuits manual. The integrated circuit used...