![]() Typical examples are the well known NPN and PNP industrial and military types, 2N2222 and 2N2907, which have been used for over four decades and are still being used in many designs. High frequency and microwave engineering. ![]() ![]() The 2N2222, 2N2905, and 2N3055 devices, for example, which date back to the 1960s but have been improved, are still useful in new designs and are still popular for experimenters. Build your own low-power transmitters: projects for the electronics experimenter. ^ Dennis Barnaal, 'Analog and Digital Electronics for Scientific Application' Breton Publishers pp.301 1982 ISBN4-X.^ William Rynone 'Linear Active Circuits - Design and Analysis' Artech House pp.19 1986 ISBN0-89006-199-8.^ Gordon McComb 'The Robot Builder's Bonanza' McGraw-Hill Professional 2001 pp.261 ISBN978-0-07-136296-2. ![]()
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