with the introduction of IC's,do u think fets,bjts now lost it?(as in case of modulation techniques)?
441296
In certain low volume and high speed circuits, transistors will always have their places. ALthough their are now many more radio chips.\nMIKE
495285
It's going to be one or the other, it doesn't change during function.\n\nThe junctions are determined when the transistor is manufactured, it's part of the physical structure of the device, so it's polarity does not change.
549750
For a period of time in the early 20th Century there WERE in fact B batteries. They were used to supply the ANODE voltage ( Plate voltage ) in vacuum tube devices like early radio equipment.  With the improvements that soon followed in converting AC to DC, it became less expensive to 'develop' the B voltage from a circuit called a 'power supply' and use of B batteries was confined to  'portable' devices.\n\nWith the development of the transistor, B voltage was no longer needed at all, and B batteries virtually disappeared from the market.
800315
visit\nhttp://www.allaboutcircuits.com/vol_3/chpt_7/5.html
244997
An operational amplyfier has a gain of one.Thetrefore it is very ussefull in logic circuitry.
1184244
Very Large-Scale Integration \nVery-large-scale integration (VLSI) of systems of transistor-based circuits into integrated circuits on a single chip first occurred in the 1970s as part of the semiconductor and communication technologies that were being developed.\n\nThe first semiconductor chips held one transistor each. Subsequent advances added more and more transistors, and as a consequence more individual functions or systems were integrated over time. The microprocessor is a VLSI device.\n\nThe first "generation" of computers relied on vacuum tubes. Then came discrete semiconductor devices, followed by integrated circuits. The first Small-Scale Integration (SSI) ICs had small numbers of devices on a single chip – diodes, transistors, resistors and capacitors (no inductors though), making it possible to fabricate one or more logic gates on a single device. The fourth generation consisted of Large-Scale Integration (LSI), i.e. systems with at least a thousand logic gates. The natural successor to LSI was VLSI (many tens of thousands of gates on a single chip). Current technology has moved far past this mark and today's microprocessors have many millions of gates and hundreds of millions of individual transistors.\n\nAs of mid-2004, billion-transistor processors are not yet economically feasible for most uses, but they are achievable in laboratory settings, and they are clearly on the horizon as semiconductor fabrication moves from the current generation of 90 nanometer (90 nm) processes to the next 65 nm and 45 nm generations.
897223
possible that you may be talking about integrated circuits for electronic organs (musical instruments)? \n\nOtherwise are you interested in organic polymers and semi-conductors use in integrated circuit? \n\nTry some of the above on a search engine.
202333
try it... then you might want to go into details like integrated circuits ICs and transistors...\n\nhttp://en.wikipedia.org/wiki/Microprocessor
164888
Read this page. I hope it will help you.\nhttp://www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/mosfets.shtm
1144534
There are still issues on nanomanufacturing.  If you want to know, nano-electronics are made from nanotransistors.  These nanotransistors are made from carbon nanotubes - they look like sot after a chimney sweep.\n\nThere are already companies involved in nanotechnology.  A few of them are in Massachusetts.  I believe the new generation of optical electronics will have nanotechnology - probably around 2008.
159857
this si not a physics question. this is a basic IC that perhaps still and certainly at one time was available at radio shack. the ic 741 behaves as ANY op amp and it is electronics 101.......happy homeworking.
1124659
7400 series logic was associated with bipolar technology \nwhile 4000 with cmos\n\nHowever op-amp741 and 7400 are labeled for different reasons.
34598
Wireless devices will be everywhere. The phone, camera, and computer will merge with the internet. Vast databases of information will store, calculate, and notate every change everywhere. We will lose more privacy because of satellite imaging and web cameras. I know communications will become "one touch" access. The way we communicate will make the biggest changes. Look at what engineers have accomplished so far. Electronics is communication.
595514
yeah i believe it\n\nlook back at your history books of technology, you'll see a big jump from old large vacuum tubes to microcircuits and microchips.. we couldnt have discovered it that quickly. a UFO probably brought us the technology we're using today
90104
If the transistor is stabilized in some circuitry, heat should not affect it too much. A simple amplifier using voltage divider biasing is very stable, whereas simply feeding a signal into the base with the B-E junction forward biased will be very unstable. In the first situation, the stability factor can be made to equal 5. In the second example the stability factor will approximate the beta of the transistor. (Lower S => more stable)
995254
There is indeed one in development that a researcher used on himself to test out embedded technologies.  There are number of news articles about it (well not really news since it was 1998)\n\nSee sources for links
702676
I'll say this much, there will always be structures and structures that need repair/modification and they will always be wherever you are. Electrical infrastructure is one thing that will be around for a long time, but electrical design and electronics design are getting offshored big time. In the 70's thru early 80s my part of the country was huge in defense contracts, then a downturn and tons of EEs out of work. Then telecom boomed and they became "valuable assets" due to the "shortage". Then telecom busted and EEs were on the street again and the recovering is slow in coming. Nanotech is supposed to be the next big thing around here, who knows when it will bust