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Voq
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If you have any material (books, links, articles) on transistors i would appreciate that. I am looking for a way to get more general knowledge on subject. Thank you.
Voq said:If you have any material (books, links, articles) on transistors i would appreciate that. I am looking for a way to get more general knowledge on subject. Thank you.
They are both correct? Current is dependent on a voltage, so there must always be a voltage for there to be a current.LvW said:Voq - if you want to gain more and deeper knowledge on "how a transistoir works", I think the following hint is very important:
Comparing different knowledge sources (books, articles, internet contributions) you will - surprisingly - notice that two different explanations still exist:
1.) BJT as a current-controlled device: The collector current Ic is a result of (and will be controlled by) the base current Ib
2.) BJT as a voltage-controlled device: The collector current Ic is a result of (and will be controlled by) the base-emitter voltage Vbe.
Apparently, only one answer (physical working principle) can be correct. In the past, this subject was already intensively discussed - also in this forum.
An answer to this question may be of less inportance as long as you are using only formulas and design strategies readily available for building transistor amplifiers.
However, if you want to know what`s really going on and if you want to discover new application areas it is of great importance to know if answer 1) or answer 2) gives the correct description.
In this context, I recommend all BJT-related contributions from the universities of Berkeley and Stanford as well as from the MIT.
(Don`t rely on some obscure and simplified online tutorials) .
For example, see here: http://web.eng.ucsd.edu/ece/courses/ECE65/Spring2014/FN-Notes/main/BJT.pdf
Transistors are electronic devices that are used to amplify or switch electronic signals. They consist of three layers of a semiconductor material, with two layers being the same type (either N-type or P-type) and the third layer being the opposite type. When a small current is applied to the middle layer, it can control a larger current flowing between the other two layers, allowing for amplification or switching of signals.
Transistors were first invented in 1947 by John Bardeen, Walter Brattain, and William Shockley at Bell Labs. This discovery revolutionized the field of electronics, as it replaced the bulky and inefficient vacuum tubes that were previously used in electronic devices. The first transistors were made of germanium, but later advancements led to the use of silicon, which is still the most commonly used material in transistors today.
There are two main types of transistors: bipolar junction transistors (BJTs) and field-effect transistors (FETs). BJTs have three layers of semiconductor material and are commonly used for amplification, while FETs have only two layers and are often used for switching. Within these categories, there are also different subtypes such as NPN and PNP BJTs, and MOSFETs and JFETs for FETs.
Transistors play a crucial role in modern electronic devices. They are used in computer processors, radios, televisions, smartphones, and many other electronic devices. In computers, transistors are used to amplify and switch electrical signals, allowing for the processing and storage of large amounts of data. In radios and televisions, transistors are used to amplify and tune in to specific frequencies. And in smartphones, transistors are used in the microchips that control and process all of the device's functions.
There are many books, links, and articles available for learning about transistors. Some good resources include "The Art of Electronics" by Paul Horowitz and Winfield Hill, "Transistor Basics" by Mike Tooley, and online resources such as All About Circuits and Electronics Tutorials. Additionally, universities and colleges often offer courses in electronics and semiconductor devices that cover transistors in depth.