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What are transistors made of?
Transistors are made from semiconductor materials. Silicon transistors are currently the most common.COMMONSiliconGermaniumGallium-Arsenide (GaAs)Silcon-GermaniumGallium Nitride (GaN)DiamondRARE
What do transistors do in a circuit?
Transistors provide most of the activities a circuit needs to operate. In their most basic representation, transistors are amplifiers. That is, they take and amplify a signal from the level produced by a microphone and amplify it enough to blast it out through a speaker. Transistors are also used on decision making circuits, like electronic gates and Central Processing Units (CPUs). Solid state, electronic systems like desktop computers, cell phones, and GPS devices would not be possible without transistors.
How many transistors are in a radio?
Depends on the radio. Early Transistor radios started with just one and it was to replace the valve which was in turn used for signal amplification. Today, a sophiticated radio may have several chips inside them that can contain millions of transistors each. There is no absolute definitive answer to this question.
What was a Hybrid Radio?
One form of hybrid radio, appearing in the late 1950s, used valves (vacuum tubes) and transistors together. Early transistors worked fine at audio frequencies, and were much more efficient, using much less battery power. They could not perform at radio frequencies, however. Vacuum tubes had been used at radio frequencies for many years, but the push to miniaturise them led to lower performance. Even the subminiature types (about the diameter of a cigarette) still used a lot of battery power to operate. The hybrid radio used valves in the radio frequency end (usually three) and transistors in the audio end (usually two). This design made best use of the advantages of valves and transistors. Transistor development was rapid, and all-transistor radios appeared soon after hybrid sets were marketed. They were only available as battery portables. Hybrid sets are among the rarest of mass-produced radios.
Why was the field effect transistor invented?
Field-effect transistors were invented by Julius Edgar Lilienfeld in 1925 and by Oskar Heil in 1934, but practical devices were not able to be made until 1952 (the JFET). The MOSFET, which largely superseded the JFET and had a more profound effect on electronic development, was first proposed by Dawon Kahng in 1960.
