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Glossary / Dictionary of Electronics Terms - U

UHF - Abbreviation for "ultra high frequency.

ultrasonic - Signals that are just above the frequency range of human hearing of approximately 20 kHz.

uncharged - Material having atoms with the same number of electrons in orbit as the number of protons in the nucleus. Having no electrical charge.

unijunction transistor - Three terminal device that acts as a diode with its own internal voltage divider biasing circuit.

unity gain frequency - Frequency of operation for a device where the gain of the component drops to unity.

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