Driver for oscillograph (T459E)

This circuit from an old MIT documentation excites an oscillograph element, an old waveform viewer.

Metal Detector (CB5334E)
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The...
Segment decoder (CB6601E)
This circuit was obtained from a 1966 General Electric documentation. It can serve as a basis for...
Extremely low power alarm C106 (CB24134E)
The quiescent current of this alarm is in the order of microamps and the same is true for the...