AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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Low hysteresis comparator (CB6085E)
Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...
Long time timer (CB9683E)
Found in documentation from the 1980s, this circuit makes use of discrete components of the time....
High Impedance Transistor Amplifier (CB12207E)
With this 1-transistor circuit we have a high input impedance and good gain. The circuit is from a...