We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
We found this circuit in the May 1972 issue of Radio Electronics magazine. Its purpose is to teach...
This circuit is from 1985 documentation. The integrated circuit used is not very common today, but...
This circuit consists of a simple continuity test with two transistors forming a relaxation...