UFD
Initialism of USB Flash Drive.
Industrial electronics
590 entries in this trade.
UHF
Initialism of Ultra High Frequency.
UHV
Initialism of ultra-high voltage.
ultra large scale integration
An integration type for digital circuits that contain more than one million transistors providing hundreds of thousands of logic gates per chip.
unclocked
adjectiveIndustrial electronics
Not measured or regulated by a clock; asynchronous.
unground
To remove a connection to ground potential.
ungrounded
adjectiveIndustrial electronics
Not connected to ground potential
unijunction
(often attributive) A transistor that has a single junction.
universal logic gate
A logic gate that can be used to re-create the function of all other logic gates.
unlooper
A device used to break a smart card's microcontroller out of an infinite loop state that makes it otherwise unusable.
upconversion
Conversion of a lower radio frequency to a higher frequency, possibly using a mixer.
UPS
Initialism of uninterruptible power supply/source.
USB key
A USB drive used to identify and authenticate a user.
UTP
unshielded twisted pair, a type of cable used for computer networking and telecommunications
varactor
A solid-state diode whose capacitance varies with the applied voltage.
VCC
Common Collector Voltage; the positive supply voltage for an integrated circuit containing bipolar junction transistors.
VCO
Initialism of voltage controlled oscillator.
VDL
Initialism of vernier delay line.
vertical alignment
A style of liquid crystal display (LCD) that is naturally stored in an upright vertical position, producing a black image until an electrical current is introduced.
very large scale integration
An integration type for digital circuits that contain hundreds of thousands of transistors providing hundreds of thousands of logic gates per chip.
very-large-scale
adjectiveIndustrial electronics
Of a system, containing hundreds of thousands of transistors on a single integrated circuit.
VHF
adjectiveIndustrial electronics
Initialism of very high frequency.
VHSIC
Abbreviation of very high speed integrated circuit.
via
An electrical connection which connects two or more layers on a printed circuit board or an integrated circuit.
VLB
Initialism of very large board, a large printed circuit board.
VLF
Initialism of very low frequency.
VOC
V_(OC): initialism of open-circuit voltage.
voice coil
A coil of wire attached to the apex of the cone of a loudspeaker that provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.
voiceband
The range of frequencies typically audible to humans, from about 20 Hz to 20 kHz.
volatile memory
Computer memory (such as RAM) that requires a constant electrical charge to maintain its contents.
voltage divider
A type of simple electronic circuit which reduces any input voltage by a fixed factor using sources of impedance (such as resistors) connected in series.
voltage multiplier
An electronic circuit that provides an output voltage higher than the input voltage, by means of capacitors and diodes.
VPU
Abbreviation of vector processing unit.
VSB
Initialism of vestigial sideband.
wafer-scale integration
A rarely-used system of building very large integrated circuit networks that use an entire silicon wafer to produce a single "super-chip".
waiting time
The total amount of time in which a process spends in a ready queue before it reaches the CPU.
watchdog
To be continuously reset by a watchdog timer.
wavemeter
An instrument which measures radio (and other electromagnetic) wavelengths
Western Union splice
A method of tightly joining two ends of metal wire by twisting each around the other.
Weyl fermion
A massless quasiparticle and fermion, which carries electric charge, and cannot move backwards, that may exist in Weyl semimetals, where an electron can be split into two Weyl fermions which move in opposite directions, which can form an electron by combining two Weyl fermions.
white plague
The white gold-aluminium intermetallic compound Au₅Al₂, which can be formed when gold and aluminium are heated in direct contact (for instance, at an electrical junction between gold and aluminium components).
WideUltra SCSI
A cross between the Ultra SCSI and Wide SCSI interfaces which uses a 16-bit bus.
WORM drive
A write once, read many drive; data storage technology that allows information to be written to a disc a single time and prevents the drive from erasing the data.
write once
adjectiveIndustrial electronics
Of a type of storage technology in which data, once written, cannot be erased or modified.
write once, read many
phraseIndustrial electronics
A data storage device in which information, once written, cannot be modified.
WSI
Initialism of wafer-scale integration.
WSS
Initialism of Wavelength Selective Switching.
Zener diode
A semiconductor junction device through which current flows normally in the forward direction, and in the reverse direction if a large voltage is applied.
ZOH
Initialism of zero-order hold.
zombie finger
A finger that cannot be recognized by a touchscreen for these reasons.