The world's first transistor radio, the Regency TR-1 from Industrial Development Engineering Associates in Chicago. TI engineers built a prototype in four days in 1954, and the two companies then further refined the design. The final version, released Oct. 18, 1954, measured 5 x 3 x 1.25 inches and was the smallest radio yet produced.
Although it brought recognition, the TR-1 didn't make much money. To avoid alienating customers, the radio sold for $49.95. Other transistor radios quickly followed.
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Bill Detwiler is Managing Editor of TechRepublic and Tech Pro Research and the host of Cracking Open, CNET and TechRepublic's popular online show. Prior to joining TechRepublic in 2000, Bill was an IT manager, database administrator, and desktop support specialist in the social research and energy industries. He has bachelor's and master's degrees from the University of Louisville, where he has also lectured on computer crime and crime prevention.