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What is the purpose of the Unijunction Transistor?

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2012-06-01 15:24:07
2012-06-01 15:24:07

A Unijunction Transistor is a transistor that acts solely as a switch.

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JFET is a unijunction transistor.


Bipolar. Unijunction. FET. MOSFET.


UJT is unijunction transistor where as BJT is bi- junction transistor.




A bipolar junction transistor can be used as a diode by shorting the base and collector.A junction field effect transistor operates as a reverse biased diode, but some types will be damaged or destroyed if forward biased.A metal oxide semiconductor field effect transistor is not a diode.A unijunction transistor is a diode with 2 connections some distance apart on its cathode (called base 1 and base 2).A programmable unijunction transistor is really a variation on the silicon controlled rectifier.etc.


Based on the application, a transistor can be used as a switch or a signal in a circuit.


UJT(UNIJUNCTION TRANSISTOR) is a three-lead electronic-semiconductor device with only one junction that exclusively as an eletrically controlled swtich andit is not used as a linear amplifier.


UJT (UniJunction Transistor): It is a transistor with only one junction and three terminals: an emitter (E) and two bases (B1 and B2). BJT (Bipolar Junction Transistor): This type of transistor consists of two junctions and three terminals, namely Emitter "E", Base "B" and Collector"C". There are two types of BJT, i) PNP and ii) NPN.


A Darlington transistor is a composite transistor. The definition is a combination of two or more transistors that have the purpose of increasing the current gain.


put (programmable unijunction transistor) he Programmable Unijunction Transistor behaves much like a unijunction transist or (UJT), but is "programmable" via external resistors (that is, you can use two resistors to set a PUT's peak voltage). Note that the name is a bit of a misnomer -- as a thyristor, it is a four layer device, unlike a true unijuncti on transistor which has but two layers. Like other thyristors, a PUT looks much like a junction transistor with a fourth layer and therefore a total of three P- N junctions. Meanwhile, a third terminal, the gate (G), makes a PUT function like a hybrid of transistor and diode: PUT symbolPUT cross-section PUTs are not often used in BEAM; they're essentially special-purpose devices in electronics, used for lightingcontrol, motor speed control and othervariable power applications. In combination with an SCR they can, though, makea mean solar engine. In a pinch, you can build up something much like a PUT from discrete transist ors wired as a complementaryfeedback Here, as soon as any current flows in either transistor, this current becomes base current for the other transistor, and both transistors turn on hard. This means you can only build up this circuit using low-leakage transistors ('though this should be the case with any decent- quality modern transistor ).


A small signal NPN transistor used for general purpose audio amplifiers and switching.



Based on the application, a transistor can be used as a switch or a signal amplifier in a circuit. - Neeraj Sharma



No, it's a PNP general purpose transistor.


Depending on how the transistor is biased and various other circuits connected to it, a transistor acts as an amplifier and/or switch. When acting as an amplifier the circuit containing the transistor can do things like transmit or receive radio signals, perform analog mathematical calculations, generate waveforms, etc. When acting as a switch the circuit containing the transistor can do things like turn on/off a light, turn on/off a motor, perform digital logic or mathematical operations, fetch and decode computer instructions, etc. Exactly what a transistor can do is really only limited by the system requirements and the designer's imagination as to how to meet those requirements. There are several different types of transistors: bipolar junction transistors (BJTs), field effect transistors (FETs), unijunction transistors (UJTs), programmable unijunction transistors (PUJTs), spacitors, surface barrier transistors (SBTs), tetrode transistors (TTs), point contact transistors (PCTs), etc.


Sort of. The Bipolar Junction Transistor, or BJT, is a type of transistor. But the term transistor applies to a much wider family of components than just the Standard BJT. A rough list of the other common types of transistors includes:Field effect transistors, or FETs, including both Junction types and Metal-oxide Semiconductor types: JFETs and MOSFETs. and also UJTs or unijunction transistors.In a basic electronics course, though, if you say just 'transistors' it is assumed you mean BJTs.


No. A unijunction transistor (UJT) is entirely different in design and application than a bipolar junction transistor (BJT). The UJT works on the principle of voltage modulation of the effective substrate resistance, while the BJT works on the principle of current amplification from one junction to the other, usually base-emitter to collector-emitter.


PUT: programmable unijunction transistor It is a device like the thyristor only the gate is connected to the N type material near the anode. It is usually used in time delay, logic and SCR trigger circuits In the PUT, Gate is always positively biased w.r.t cathode. When anode voltage exceeds the gate voltage by about 0.7 V, first junction that is the junction right after the anode gets forward biased and PUT turns on. When anode voltage becomes less than the gate voltage, PUT is turned off.


General Purpose Medium Power NPN Transistor


The symbols in the unijunction transistor show its internal configuration. The emitter (arrow) represents the polarity. When it points in that is a P type transistor. Pointing out is an N type. The the table on its side the table top touching the emitter (arrow). Its' "legs" are the connection to two bases in the device. It does not have a collector. Refer to another Wiki answer for more info.


A Darlington transistor it may contain one or more transistor in its case. the purpose is to amplify current by beta multiplication.


In unijunction transister there be a only one P-N Junction like diode, and current conduction takes place by either through holes or electrons.


A transistor has the same purpose(s) as a triode vacuum tube. It allowed dramatic miniaturization and efficiency improvements, especially when it was figured out how to make monolithic integrated circuits containing them.



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