Driver for oscillograph (T459E)

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

Amplifier with External Gain Control (CB13229E)
This operational amplifier configuration has gain controlled by an external voltage applied to a...
Automotive Tachometer (CB12605E)
This circuit is from a 1978 publication, being connected to the contact breaker of cars that still...
TN4015H 40 A SCRs for High Temperature (COM178E)
January 2017 - STMicroelectronics' new TN4015H SCRs with 40 A currents and high temperature...