TRANSISTORS FOR INDUSTRIAL APPLICATIONS

industrial application of bjt

Greetings of peace and love!!!
I am a fourth year ece student, and I would like to ask for help about my report, TRANSISTORS FOR INDUSTRIAL APPLICATIONS, I really needed your help.
Thanks ahead and God Bless...!

industrial applications of transistors

HI DEAR,
In the early days of transistor circuit design, the bipolar junction transistor, or BJT, was the most commonly used transistor. Even after MOSFETs became available, the BJT remained the transistor of choice for digital and analog circuits because of their ease of manufacture and speed. However, the MOSFET has several desirable properties for digital circuits, and since major advancements in digital circuits have pushed MOSFET design to state-of-the-art. MOSFETs are now commonly used for both analog and digital functions.


BJT used as an electronic switch, in grounded-emitter configuration
Amplifier circuit, minimal common-emitter configuration
[edit] Switches
Transistors are commonly used as electronic switches, for both high power applications including switched-mode power supplies and low power applications such as logic gates.


[edit] Amplifiers
From mobile phones to televisions, vast numbers of products include amplifiers for sound reproduction, radio transmission, and signal processing. The first discrete transistor audio amplifiers barely supplied a few hundred milliwatts, but power and audio fidelity gradually increased as better transistors became available and amplifier architecture evolved.

Transistors are commonly used in modern musical instrument amplifiers, where circuits up to a few hundred watts are common and relatively cheap. Transistors have largely replaced valves in instrument amplifiers. Some musical instrument amplifier manufacturers mix transistors and vacuum tubes in the same circuit, to utilize the inherent benefits of both devices.


[edit] Computers
The "first generation" of electronic computers used vacuum tubes, which generated large amounts of heat and were bulky, and unreliable. The development of the transistor was key to computer miniaturization and reliability. The "second generation" of computers, through the late 1950s and 1960s featured boards filled with individual transistors and magnetic memory cores. Subsequently, transistors, other components, and their necessary wiring were integrated into a single, mass-manufactured component: the integrated circuit. Transistors incorporated into integrated circuits have replaced most discrete transistors in modern digital computers.


[edit] Advantages of transistors over vacuum tubes
Before the development of transistors, vacuum tubes (or in the UK thermionic valves or just valves) were the main active components in electronic equipment. The key advantages that have allowed transistors to replace their vacuum tube predecessors in most applications are:

Smaller size (despite continuing miniaturization of vacuum tubes)
Highly automated manufacture
Lower cost (in volume production)
Lower possible operating voltages (but vacuum tubes can operate at higher voltages)
No warm-up period (most vacuum tubes need 10 to 60 seconds to function correctly)
Lower power dissipation (no heater power, very low saturation voltage)
Higher reliability and greater physical ruggedness (although vacuum tubes are electrically more rugged. Also the vacuum tube is much more resistant to nuclear electromagnetic pulses (NEMP) and electrostatic discharge (ESD))
Much longer life (vacuum tube cathodes are eventually exhausted and the vacuum can become contaminated)
Complementary devices available (allowing circuits with complementary-symmetry: vacuum tubes with a polarity equivalent to PNP BJTs or P type FETs are not available)
Ability to control large currents (power transistors are available to control hundreds of amperes, vacuum tubes to control even one ampere are large and costly)
Much less microphonic (vibration can modulate vacuum tube characteristics, though this may contribute to the sound of guitar amplifiers)
" Nature abhors a vacuum tube " Myron Glass (see John R. Pierce), Bell Telephone Laboratories, circa 1948

indutrial transistor

You mean power Transistors or POwer MOSFETs do you?

Because these are more popular in industrial applications.

transistor applications ck722

look in wikipedia...

industrial applications in transistor

Maybe I can add some earlier stuff too:

The first transfer-resistor (transistor) theorized was the JFET. Unfortunately they couldn't figure out how to make one with the current state of technology. Instead they made a Germanium transistor.

The first transistor available to the public was the CK722 Germanium Junction Transistor from Raytheon, circa 1956. There is a web site dedicated to this transistor:

"h**p://www.ck722museum.com/"

I remember my dad had more than one book on how to use this single transistor.

Germanium has a low half-cell voltage and shows about 0.2v but is also very leaky in both directions. It took a totally different class of engineers to apply these successfully, but they did an astounding job. I remember seeing a professional GE 2-way radio with a potted revolutionary circuit for demodulating FM (or PM) called a "phase locked loop". It's common place today, but they got it working using those leaky, discrete, Germanium transistors.

The first commercially successful power transistor was also a Germanium transistor. It was a PNP in a TO3 case (I think again Raytheon, but I'm not sure) and was used as the audio output for car radios in a CLASS-A configuration. That's why those old car radios had such a huge heat sink on the back. This is the transistor that the industrial control people first applied to machine control.

It wasn't that long before the industry figured out how to make silicon transistors.. which is where the previous post picks up.

I hope that helps. That is all I had exposure to; Check that link I gave earlier, that has a lot of interesting stuff linked to it with much better info.

industrial application of transistors

there are many....what is the exact criteria......