5V Powwr Supply Crowbar protection MC3425 (CB14530E)

This circuit is suggested by Motorola in its 1990 Linear Databook. The integrated circuit is no longer common in the market.

Triac Three Phase Motor Control (CB4261E)
In the figure we have the way to make the three-phase control of a motor using opto-diacs. The circuit is...
Transistor Test (CB22567E)
This circuit for testing the voltage gain of a transistor was found in the March 1953 issue of...
Insect repellent (CB8102E)
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...