
A Zener diode is a diode which allows current to flow in the forward direction in the same manner as an ideal diode, but also permits it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage, `Zener knee voltage`, `Zener voltage`, `avalanche point`, or `peak inverse voltage`. The device w...
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http://en.wikipedia.org/wiki/Zener_diode

A voltage regulator. Included in this glossary to help fill the 'z' requirement, and legitimised by its inclusion in Richard Ballantine's Ultimate Bicycle Book, listed there for the same purpose.
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http://www.bikereader.com/contributors/SAM/glossary.html

(from the article `semiconductor device`) This voltage regulator is a p-n junction diode that has a precisely tailored impurity distribution to provide a well-defined breakdown voltage. It ...
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http://www.britannica.com/eb/a-z/z/5

A diode which is designed to work in a reverse biased condition, and is used primarily for voltage regulation.
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http://www.encyclo.co.uk/local/20870

a solid-state device used to regulate voltage in motorcycle charging systems.
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http://www.horizonsunlimited.com/gear-up/motorcycle-terms-and-glossary

The zener diode is a type of semiconductor diode, consisting of a p-n junction with high doping concentrations on either side of the junction. It acts as a rectifier until the applied reverse voltage reaches a certain value, known as the Zener breakdown voltage, when the device becomes conducting. This effect occurs as a result of electrons being e...
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http://www.probertencyclopaedia.com/browse/GZ.HTM

A diode that has been specially designed to break down at a particular voltage, consisting of a p-n junction with high doping concentrations on either side of the junction. It acts as a rectifier until the applied reverse voltage reaches a certain value, known as the Zener breakdown voltage, when the device becomes conducting. This effect occurs as...
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https://www.encyclo.co.uk/local/20687

a semiconductor diode across which the reverse voltage remains almost constant over a wide range of currents, used esp. to regulate voltage.
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https://www.infoplease.com/dictionary/zener-diode
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