Amplitude Comparator (CB22533E)

This circuit was found in a Radio Electronics of August 1952. The transistors are germanium types of the time. The circuit drives a relay as a load.

Heads and Tails (CB4559E)
This circuit was obtained from Everyday Electronics magazine of August 1974. The circuit is still...
Sencore transistor test (CB22546E)
This test, the commercial transistor tester, had its diagram published in an article in Radio...
Fluorescent Emergency Light (CB17146E)
This emergency lighting circuit includes a small inverter for a small fluorescent lamp. The...