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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