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Through a process known as doping, impurities are added to a slab of silicon, causing the metal to act as an electrical switch Semiconductors are metals that can be manipulated to be either good or bad conductors of electricity the first transistors were made of germanium and gold, but modern transistors are constructed from silicon semiconductors are what make up the majority of electronic circuits that we find in our computers transistors allowed for the development of smaller, faster machines at a lower cost these also used semi conductors Transistors: history of switches which affect the evolution of computersġ930's - electromagnetic relays served as physical switches, whose on/off positions were controlled by the voltage to a magnetġ940's - vacuum tubes replaced relays, which were faster (since no moving parts) but tended to overheat and burn out frequentlyġ948 - the transistor was developed by Bardeen, Brattain, and ShockleyĪ transistor is a solid piece of metal attached to a wire that serves as a switch by alternatively conducting or resisting electricity.
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The phosphors were made in a way that caused them to glow either red, green or blue light the three of them were called triads the electron gun could crete brightness and dimness based on the intensity of the ray but this was a health hazard because of the intense X raysĮlectron gun controlled brightness and triads contorlled color But these days the technology is different no more electron guns and their accompanying spray of x rays the notation is still used through and modern LED and LCD screens still use pixels of red, green and blue.Įlectron gun: this is called a color cathode ray tube (CRT) this would use phosphors to use primary colors and shoot a line of electrons to produce color on the screen in early computers there would be a large box at the end of computers with 3 electron guns and cirtu tracy. There are so many color schemes so there is for example RGB (red green blue) where through combinations with dark and light almost all colors can be createdĬTR (yoke with red green and blue guns these are machines that paint the color on ones copuros screen. Storing colors: like numbers no switch setting is red or purple or ect.