High impedance stage (CB20564E)

This high input impedance amplifier stage was found in a 1963 documentation. The transistor germanium of the time.

Mini drill control (CB8767E)
This control for 12 V drills was found in a 90s Elektor. The components are current, and Q1 can be...
50 V switched inverter (CB9951E)
This circuit was obtained from an American documentation from the 1970s. Information on the...
Symmetric Power Supply 15 V x 1.5 A (CB14525E)
The integrated circuit used in this 1990 project is uncommon in our market, and transistors...