Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

Telephone Call Sign (CB16888E)
The presented circuit activates a relay when a telephone call occurs. The relay can be used to...
SIDAC Gas Stove Lighter (CB12544E)
SIDACs are not yet common components in power applications that involve voltage tripping. However,...
Optical Isolator and AC Trigger Power Switch (CB12414E)
This solid-state relay (SSR) or shield was found in a 1995 Electronics Now. The transistor can be...