Driver for oscillograph (T459E)

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

Zener Regulated Wien Oscillator (CB14907E)
This sinusoidal oscillator was found in Radio Electronics in 1989. It uses a 741, but other...
Universal Motor Control (CB24059E)
This triac circuit was taken from an article in the July 1970 Radio Electronics magazine. Note the...
Audible Voltmeter (CB21395E)
This circuit was found in an American publication from 1969. Transistors are from the time and can be...