13-05-2017, 11:22 PM
Hi, I want project report for presentation
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project report on speed control of dc motor using scr ujt
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Hi, I want project report for presentation
19-05-2017, 02:10 PM
The junction transistors are constructed from separate P and N type semiconductor materials forming a unique PN junction (hence its Uni-Junction name) within the N-type main conduction channel of the device.
Although the Unijunction Transistor has the name of a transistor, its switching characteristics are very different from those of a conventional bipolar transistor or field effect, since it can not be used to amplify a signal but is used as a switching transistor ON-OFF. UJT have unidirectional conductivity and negative impedance characteristics that act more like a variable voltage divider during the interruption.
Like the N-channel FETs, the UJT consists of a single solid piece of N-type semiconductor material that forms the main current transport channel with its two external connections marked Base 2 (B2) and Base 1 (B1) . The third connection, marked confusingly as the emitter (E) is located along the channel. The emitter terminal is represented by an arrow pointing from the P-type emitter to the N-type base.
The rectifier emission pn of the unijunction transistor is formed by fusing the type P material into the N-type silicon channel. However, the P-channel UJTs with an N-type emitter terminal are also available, but these are little used .
The emitter junction is positioned along the channel so that it is closer to the terminal B2 than B1. An arrow is used on the UJT symbol pointing towards the base indicating that the Emitter terminal is positive and the silicon bar is a negative material. The symbol, the construction and the equivalent circuit of the UJT are shown below.
Although the Unijunction Transistor has the name of a transistor, its switching characteristics are very different from those of a conventional bipolar transistor or field effect, since it can not be used to amplify a signal but is used as a switching transistor ON-OFF. UJT have unidirectional conductivity and negative impedance characteristics that act more like a variable voltage divider during the interruption.
Like the N-channel FETs, the UJT consists of a single solid piece of N-type semiconductor material that forms the main current transport channel with its two external connections marked Base 2 (B2) and Base 1 (B1) . The third connection, marked confusingly as the emitter (E) is located along the channel. The emitter terminal is represented by an arrow pointing from the P-type emitter to the N-type base.
The rectifier emission pn of the unijunction transistor is formed by fusing the type P material into the N-type silicon channel. However, the P-channel UJTs with an N-type emitter terminal are also available, but these are little used .
The emitter junction is positioned along the channel so that it is closer to the terminal B2 than B1. An arrow is used on the UJT symbol pointing towards the base indicating that the Emitter terminal is positive and the silicon bar is a negative material. The symbol, the construction and the equivalent circuit of the UJT are shown below.
![[Image: power30.gif]](http://www.electronics-tutorials.ws/power/power30.gif)
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