Peak sensor with tunnel diode (CB21514E)

This circuit was found in old General Electric documentation. The circuit makes use of a unijunction programmable transistor.

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Flame Detector (CB17581E)
This circuit detects the presence of a pilot flame in heating systems by the presence of infrared...
SUS Frequency Divider (CB19903E)
In the figure we have a circuit that uses unusual components, being indicated for low frequency...
Triangular and square generator (CB21449E)
Found in older Signetics documentation, this circuit generates signals from 30 Hz to 25 kHz....