Null Indicator (CB21930E)

This bridge was found in a Raytheon transistor manual from the 1960s. The transistors are germanium from the time.

Photodiode Amplifier (CB905E)
The gain for this circuit is given by the ratio between R2 and R1. The circuit is suggested by...
Telephone Line Simulator (CB17698E)
The circuit suggested in a 2009 documentation serves as support for the technician who works in...
Two Input Stereo Mixer (CB4438E)
a We find this circuit which has a traditional configuration in a 1988 publication. The circuit is...