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.

Guitar Level and Solo Switch (CB17046E)
This circuit was found in a 1997 documentation but uses absolutely common components today. The...
Power control with reset (CB8146E)
This circuit was found in a 1967 General Electric manual. It has a circuit that discharges the...
1 Hz Time Base 2 (CB24205E)
We found this time base circuit in a timer project from the August 1972 Radio Electronics...