Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

Window Comparator 741 (CB5076E)
This conventional window comparator configuration was found in an old documentation. It is valid...
Audio Controlled Switch (CB21262E)
This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of...
Control logic circuit (CB6547E)
This high voltage circuit was found in a 1970 documentation. The integrated one is of the time and...