3-IC AD converter (CB9028E)

Found in American documentation from the 70s, this circuit uses components of the time, uncommon today.

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Commercial 7 Transistors Radio (CB14612E)
This circuit from the 70's used germanium transistors and operated in the range of medium and...
Rectangular to triangular converter (CB24194S)
The figure shows how to convert a rectangular signal into a triangular signal using an integrator. The...
Tremulo circuit (CB10115E)
This circuit was found in a National Semiconductor manual from the 1970s, appearing in articles and on...