Transistor Tester (CB21956E)

This transistor tester was found in a publication by Gernsback from 1960. The circuit can be used with current transistors.

Precision current drains (CB15421E)
In figures 1 and 2 we have two current drains that can be made with operational amplifiers and...
High Sensitivity Fan Control (CB15519E)
Great sensitivity for the circuit can be obtained with a Darlington amplification step for the...
Multi pellet diode regulator (CB8798E)
The used diode is an unusual component today. We found this 12 V regulator in documentation from the...