Found in a 1947 publication, this circuit is intended for the analysis of tube circuits.
Using a 12 V transformer, this unit can provide a much higher output voltage. The circuit is from a 90’s...
Found in Linear Technology documentation from the 1980s, this circuit has an accuracy of 0.01%....
This circuit was found in a 1967 EEE. The transistors are from the time and can be tested...