Found in an old Xicor documentation, this circuit makes use of an X9241, which contains four digitally controlled analog potentiometers.
This circuit from an old Argentine publication shows how it is possible to use a tunnel diode in a...
To invert the rotation of a motor by changing the levels of an Arduino output or another...
This ultra-low distortion driver was found in 80's Analog Devices documentation. The circuit has a...