FET Switch (CB6725E)

This switched filter was found in the 1969 documentation. The FET should be current-matched and eventually equipped with a heat sink.

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Alarm with the 555 (CB6777E)
Found in an old Popular Electronics this circuit is still current. The SCR can be of the 106...
Touch Sensor 4013 (CB4609E)
This circuit triggers at the touch of the sensor, passing its output from high to low level for a...
More Than 1 A 78xx (CB15501E)
The block shown in the figure, although it is known to many readers, is not always in everyone's memory...