That said, the whole idea of the crystal diode was that the crystal itself could provide the electrons over a very small distance, the depletion region.

He began work with crystal diodes in 1922 and was involved with creating the 1N34A germanium diode at Sylvania in the 1940s.

It used 5,000 vacuum tubes and 1,500 crystal diodes.

In course of his work as a radio technician, he noticed that crystal diodes used in radio receivers emitted light when current was passed through them.

Cat's whisker diodes were also called crystal diodes and found application in crystal radio receivers.

The diode (originally a crystal diode) rectifies the AM radio frequency signal, leaving only the positive peaks of the carrier wave.

The RAYDAC used 5,200 vacuum tubes and 18,000 crystal diodes.

It contained 1,300 vacuum tubes, 1,000 crystal diodes, 100 magnetic elements (for the recording heads), and 12 relays (in the power supply).

A later version using a crystal diode is still used in crystal radio sets today.

DYSEAC used 900 vacuum tubes and 24,500 crystal diodes.