Individual discrete transistors can cost anywhere from a few cents each to a couple hundred dollars each, depending on type and parameters (e.g. power rating, breakdown voltages, speed).
Inside integrated circuits individual transistors are so cheap to make that their cost is commonly measured in micro-pennies each!
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758 Million transistors.
Transistors have two basic functions: # an electrically controlled electric switch # an electrically controlled "proportional valve" which can alter currents and voltages, or can amplify electric signals. Transistors can also be configured as Oscillators which provide an AC signal with constant frequency. Either an amplifier circuit or a switching circuit can be wired as an oscillator. Transistors can be used to form logic gates: And, Or, and Invert. Computers are made from logic gates, so computers can be made entirely from transistors. Transistors are in use in virtually all electronic devices. PC processors are composed of millions of tiny transistors. A transistor radio may have had only 6-10 transistors to enable operation. A late model car may have 10 to 15 computers comprised of thousands of transistors to perform all manner of operations in the vehicle.
They are NPN and PNP. BJT mean bipolar junction transistors. there are two P-N junctions in BJT transisters.
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There are two types of field effect transistors:junction field effect transistors andmetal-oxide semiconductor field effect transistors.