Logic level converter (CB7250E)

Found in an Electronic Design of 1965, this circuit consists of NOR gates and can be used in astable and monostable multivibrators.

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Shunt regulator (CB21217E)
This shunt voltage regulator was found in an Electronic Design from the 90's. The power transistor must...
Zener diode test (CB7958E)
Found in a 90s Popular Electronics, this circuit aims to find the voltage of a zener diode up to...
Guitar Distorsion Pedal (CB18205E)
This simple circuit with two transistors was found in a 1985 publication. The power can come from...