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Home > All Images > 1997 > August > 21 Aug 1997

Images Dated 21st August 1997

Choose from 9 pictures in our Images Dated 21st August 1997 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Hand holds transistors from the 1960s to 1990s Featured 21 Aug 1997 Print

Hand holds transistors from the 1960s to 1990s

Transistors. Hand holds an assortment of transist- ors from the 1960s to the 1980s & 1990s. Transist- ors have many uses in electronic equipment includ- ing amplification & signal processing. Transistors have three wires attached to them - the base, collector & emitter. These are attached to sect- ions of semiconductor in the transistor which have precise levels of impurities to determine their electrical properties. The amplification of the current from emitter to collector is determin- ed by the voltage of the base wire. Transistors have allowed the miniaturisation of electronic components. The first transistor was invented on 23 December 1947 by Bardeen, Brattain & Shockley

© TONY CRADDOCK/SCIENCE PHOTO LIBRARY