High impedance window comparator (CB6091E)

General Electric suggests this circuit in a 1980s documentation. The operational of the time is FET-type input. Modern equivalents may be used.

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CK722 Oscillator (CB23726E)
This 2-CK722 oscillator was found in a march 1961 Radio Electronics Magazine. The circuits need...
Triangular and square generator (CB21449E)
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....
Tone control (CB15872E)
The tone control in the figure below can be implemented with almost any operational amplifier. The power...