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There are no vacuum tubes in a transistor. A vacuum tube is an electronic device that uses a heated cathode in a vacuum to direct and control an electron stream to an anode, also known as the plate. The vacuum tube is old technology, but it is still used today, typically in high power applications such as transmitters. A transistor is an electronic device that uses solid-state semiconductors to similarly control an electron stream. The transistor is newer than the vacuum tube. It offers lower power, smaller size, easier use and other enhancements over vacuum tubes, within limits, of course, such as voltage and power.
Wiki User
∙ 14y ago
Wiki User
∙ 10y agoThere are none. Very roughly speaking, the transistor became a replacement
for the vacuum tube. An electronic device like a radio or a stereo may have
some of both, but they're separate and distinct components. Neither one
has any of the other one in it.
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What is the difference between vacuum tubes and transistors?
A vacuum tube is a current amplifier where the transistor amplifies voltageA tube is a voltage amplifier. A transistor is a current amplifier. A tube is an older design that requires substantial voltage to operate correctly. A transistor is a semiconductor device that operates on relatively low voltage.
How does a vacuum tube work?
contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the anode. Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grids.[5]
What is an unbiased transistor?
An unbiased transistor is one being used with no bias voltage to offset its operating point. If the input signal is very small it still can operate as an amplifier but the output will be non-linear. One use for an unbiased transistor is when the transistor is used as a switch, turning it on or off.
2 transistor analogy for scr and derivation for expression of anode current?
a thyristor can be considered as two complementary transistors , one pnp- transistor, and other npn transistor
Why different transistor have different resistance?
Because they are different transistors. Resistance among their internal diodes is one of the main features of a transistor.
What characteristics made the transistor better than the vacuum tube?
There were obvious differences between the trasisitor and the vacum tube. The transistor was faster, more reliable, smaller, and much cheaper to build than a vacuum tube. One transmisor was the equivalent 40 vacuum tubes. They also didn't produce heat compare it to a vacuum tubes. Conduct electricity faster and better than vacuum tubes.
What is transistor noise?
http://www.vias.org/transistor_basics/transistor_basics_04_05_03.html The minimum signal that can be applied to a transistor is limited by the internal noise generated by the transistor. Since the transistor does not require cathode heating (one of the major noise sources in the vacuum tubes), it is inherently capable of operating at lower noise levels than its vacuum tube brother. At present, the junction transistor is equal to the vacuum tube, insofar as its noise characteristics are concerned. The noise level of the point-contact types is between 15 and 30 db higher. see the website, there is a lot more. do more research for certainty.
What is the difference between vacuum tubes and transistors?
A vacuum tube is a current amplifier where the transistor amplifies voltageA tube is a voltage amplifier. A transistor is a current amplifier. A tube is an older design that requires substantial voltage to operate correctly. A transistor is a semiconductor device that operates on relatively low voltage.
Where can one purchase a Mesa Boogie Dual Rectifier vacuum tube from?
One can purchase a Mesa Boogie Dual Rectifier vacuum tube from online websites such as Amazon or eBay. As well as this, one may visit a vacuum hardware store.
Uses or function of vacuum tube in the circuit?
The simplest answer to that question is: Vacuum tubes were originally used to perform every function now handled by transistors. The transistor was a big improvement over the vacuum tube because in order to perform those functions, a vacuum tube needs two power supplies, including one at a comparitively high voltage, it occupies a comparitively ridiculous amount of space, and radiates a comparitively ridiculous amount of heat. When vacuum tubes were still the only way to go, there were no portable radios smaller than a Chicago phone-book, and most of their weight was made up of several heavy batteries.
What is the application of TTL in integrated circuits?
Transistor transistor logic is one type of many different types of bipolar transistor based digital logic circuitry. It is very efficiently implemented in integrated circuit chips, needs only one power supply voltage, and operates at reasonably high speeds. Transistor transistor logic was first developed in the middle 1960s as a modification of the diode transistor logic, then in use in some digital logic integrated circuit chips but dating back to the earliest discrete bipolar transistor logic developed in the late 1950s and derived from vacuum tube point contact diode logic used in many early first generation computers. Transistor transistor logic integrated circuits dominated the computer and electronic digital controller market from the late 1960s until the middle 1980s, when metal oxide semiconductor field effect transistor based microprocessors and microcontrollers began to replace it. By the early 1990s transistor transistor logic and other bipolar transistor based digital logic integrated circuits had been replaced with equivalent complementary metal oxide semiconductor field effect transistor integrated circuits that were both faster and consumed less power (thus running much cooler) or with programmable logic devices of various types. In general transistor transistor logic is now considered obsolete.
Who made the vacuum tube?
No one person invented the vacuum tube. Thomas Edison, Eugene Goldstein, Nikoli Tesla, among others were responsible.
Do vacuum tubes in computers burn out like light bulbs?
Yes, vacuum tubes in computers burn out. Transistors are much better. Vacuum tube computers no longer exist except in museums. Vacuum tube computers were originally made in World War 2 to calculate the positioning of antiaircraft guns. It was not necessary to know where the airplane was but where it would be when the explosive arrived. That was especially true when the Germans developed the buzz bomb going 450 miles an hour. When hundreds of transistors could fit in the same area as one vacuum tube, the vacuum tube vanished.
How does a vacuum tube work?
contains only a heated electron-emitting cathode and an anode. Electrons can only flow in one direction through the device—from the cathode to the anode. Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grids.[5]
The transistor that replaced the vacuum tube in the computer was is turn replaced by the?
By the logic gate. Which is just a series of transistors within one package. This was replaced by the processor which is just a group of logic gates. Effectively all microchips and processors are made up of thousands or even millions of transistors... as well as resistors and capacitors.
What are the advantage of transistor over vacuum tube?
lower power dissipationhigher reliabilitylower operating voltageinstant on (no heater warm-up time)smaller sizelighter weightmore ruggedmore efficientpossible to integrate with other devices into one packageetc.
Who was the inventor of the transistor?
This is one of those questions that has a number of correct answers. In 1925, Physicist Julius Edgar Lilienfeld filed a patent for a field-effect transistor (FET) in Canada. The FET was intended to be a solid-state replacement for the triode. Later in 1947, three American physicists at the Bell Telephone Laboratories invented the first bipolar point-contact transistor. The men were John Bardeen, William Shockley, and Walter Brattain. The three men received the 1956 Physics Nobel Prize for their joint invention. Dr. Mataré was one of a pair of German physicists who independently came up with the point-contact transistor two months later at a Westinghouse Laboratory in Paris. William Shockley also invented the junction transistor in 1951. As with most "inventions", the inventor did not wake up one morning and decide to invent the transistor. It was the culmination of the evolution of a number of earlier ideas, developments and devices. The semiconductor transistor was preceded by the triode vacuum tube which is capable of many of the same functions as your average transistor, but also, the characteristics of the various semiconductor materials, such as silicon and germanium, had to be realised, studied and developed first.
