Audio expander (CB8507E)

Based on the Philips TDA3810N, this circuit was found in an 90s Electronics Now. The circuit has two channels including the voltage regulator stage.

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Telephone Equipment Regulator (CB17315E)
We found this circuit in Texas Instruments documentation from 1986. The circuit produces a...
Schmitt trigger (CB21475E)
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
Binary AC Switch Circuit 4013 (CB25741E)
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...