transistors and thyristors?

Question

please give me some reliable website about transistors and thyristors

Answer 1

A transistor is a three-terminal semiconductor device that can be used for amplification, switching, voltage stabilization, signal modulation and many other functions. The transistor is the fundamental building block of both digital and analog integrated circuits -- the circuitry that governs the operation of computers, cellular phones, and all other modern electronics.

Introduction
The word transistor is a foreshortening of transfer resistor. The transistor is so-named because an input signal is used to vary the resistance in the path of an output signal.

Transistors are divided into two main categories: bipolar junction transistors (BJTs) and field effect transistors (FETs). Application of current in BJTs and voltage in FETs between the input and common terminals increases the conductivity between the common and output terminals, thereby controlling current flow between them. For more details on the operation of these two types of transistors, see field effect transistor and bipolar junction transistor.

In analog circuits, transistors are used in amplifiers, (direct current amplifiers, audio amplifiers, radio frequency amplifiers), and linear regulated power supplies. Transistors are also used in digital circuits where they function as electronic switches. Digital circuits include logic gates, random access memory (RAM), microprocessors, and digital signal processors (DSPs).

and

The thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act as a switch, conducting when their gate receives a current pulse, and continue to conduct for as long as they are forward biased.

Some sources define silicon controlled rectifiers and thyristors as synonymous[1]; others define SCRs as a subset of thyristors. Non-SCR thyristors include devices with more than four layers, such as triacs and GTOs[2].

You coulg get more informations at the 2 links below...

Answer 2

You should be more specific. Transistors are an extremely complex device and you can analyze them in terms of electronics, circuit theory, phyics, and your best bet is a book or a teacher.

On the other hand if you just want an overview the wikipedia site should do.

Answer 3

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals changes the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.

A thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. It acts exclusively as a bistable switch, conducting when the gate receives a current trigger, and continuing to conduct while the voltage across the device is not reversed (forward-biased). A three-lead thyristor is designed to control the larger current of its two leads by combining that current with the smaller current of its other lead, known as its control lead. In contrast, a two-lead thyristor is designed to switch on if the potential difference between its leads is sufficiently large (breakdown voltage).

Some sources define silicon-controlled rectifier (SCR) and thyristor as synonymous.Other sources define thyristors as a larger set of devices with at least four layers of alternating N and P-type material.

The first thyristor devices were released commercially in 1956. Because thyristors can control a relatively large amount of power and voltage with a small device, they find wide application in control of electric power, ranging from light dimmers and electric motor speed control to high-voltage direct current power transmission. Thyristors may be used in power-switching circuits, relay-replacement circuits, inverter circuits, oscillator circuits, level-detector circuits, chopper circuits, light-dimming circuits, low-cost timer circuits, logic circuits, speed-control circuits, phase-control circuits, etc. Originally, thyristors relied only on current reversal to turn them off, making them difficult to apply for direct current; newer device types can be turned on and off through the control gate signal. The latter is known as a gate turn-off thyristor, or GTO thyristor. A thyristor is not a proportional device like a transistor. In other words, a thyristor can only be fully on or off, while a transistor can lie in between on and off states. This makes a thyristor unsuitable as an analog amplifier, but useful as a switch.

https://www.electrikals.com/

Answer 4

http://en.wikipedia.org/wiki/Power_semiconductor_device

has hyperlinks in text that take you to thyristors and transistors.