A unijunction transistor (UJT) is a three-lead electronic semiconductor device with only one junction. It acts exclusively as an electrically controlled switch.
The UJT is not used as a linear amplifier. It is used in free-running oscillators, synchronized or triggered oscillators, and pulse generation circuits at low to moderate frequencies (hundreds of kilohertz). It is widely used in the triggering circuits for silicon controlled rectifiers. In the 1960s, the low cost per unit, combined with its unique characteristic, warranted its use in a wide variety of applications like oscillators, pulse generators, saw-tooth generators, triggering circuits, phase control, timing circuits, and voltage- or current-regulated supplies.[2] The original unijunction transistor types are now considered obsolete, but a later multi-layer device, the programmable unijunction transistor, is still widely available.
A unijunctiontransistor (UJT) is a three-lead electronic semiconductor device with only one junction. It acts exclusively as an electrically controlled...
programmable unijunctiontransistor (PUT) is a three-lead electronic semiconductor device which is similar in its characteristics to a unijunctiontransistor (UJT)...
dopants into semiconductor substrate; can be both BJT and FET. Unijunctiontransistor, which can be used as a simple pulse generator. It comprises the...
A transistor is a semiconductor device with at least three terminals for connection to an electric circuit. In the common case, the third terminal controls...
bipolar transistors with the emitter of one transistor connected to the base of the other, such that the current amplified by the first transistor is amplified...
Programmable UnijunctionTransistor: A thyristor with gate on n-type layer near to the anode used as a functional replacement for unijunctiontransistor RCT:...
in large quantities. This standardization began in the era of discrete transistor mainframes and minicomputers, and has rapidly accelerated with the popularization...
junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such...
common transistors and diodes?". EDAboard.com. 2010-06-10. Archived from the original on October 11, 2007. Retrieved 2010-08-06. I.D.E.A. "Transistor Museum...
require replacement. Modern designs now use solid state technology (transistors) to perform the same function that the relays perform in electromechanical...
seller CBOE S&P 500 PutWrite Index (ticker symbol) Programmable unijunctiontransistor Parameterized unit testing, in computer programming Put, a Hypertext...
current makes an equivalent NPN transistor switch on, which in turn draws current from the base of an equivalent PNP transistor, turning it on also. Part of...
electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These...
metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the...
A pentode transistor is any transistor having five active terminals. One early pentode transistor was developed in the early 1950s as an improvement over...
controlled sequentially, one by one, whereas AMOLED control uses a thin-film transistor (TFT) backplane to directly access and switch each individual pixel on...
invented the point-contact transistor at Bell Labs in 1947, followed by William Shockley inventing the bipolar junction transistor at Bell Labs in 1948. At...
breakdown occurs, internal positive feedback (impact ionization or two transistor feedback) ensures that the diode enters a region of negative dynamic resistance...
The junction field-effect transistor (JFET) is one of the simplest types of field-effect transistor. JFETs are three-terminal semiconductor devices that...
small magnetic loop (SML) antenna ubiquitous in AM radio broadcast band transistor radios. However, they began to be used in vacuum tube ("valve") radios...
until the transistor provided smaller and higher quality amplifiers in the 1950s. The first working transistor was a point-contact transistor invented...
electronics devices such as radios and televisions until the 1970s, when transistors replaced them. Today, their main remaining use is in high-power RF amplifiers...
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