This circuit was obtained in documentation on medical applications from 1966. The circuit is used in electromyography by switching the electrodes used with the equipment.
This circuit generates 500 Hz rectangular signals. The circuit is from old American documentation. Neon...
The circuit shown is a documentation on 80's tunnel diodes. The frequency depends on the delay line...
In the figure we have a small general-purpose amplifier with the LM386 integrated circuit and...