Three-phase power supply (CB23680E)

This circuit was found in Radio Electronics magazine from July 1960. The components used are transistors of the time.

Tunnel Diode Voltage Regulator (CB12876E)
This circuit from an old Argentine publication shows how it is possible to use a tunnel diode in a...
Breakout board for DC motor reversal (CB23714E)
To invert the rotation of a motor by changing the levels of an Arduino output or another...
50mA driver (CB20924E)
This ultra-low distortion driver was found in 80's Analog Devices documentation. The circuit has a...