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Electronic circuits and components * Course Index * Introduction * About the Author * About this Course * Feedback * Course Navigation * How to use this Course * TINA * Locktronics Fundamentals * Introduction: Fundamentals * Units and Multiples * Electricity * Electronic Principles * Electrical Circuits * Alternating Current * Assessment: Fundamentals Passive Components * Introduction: Passive Components * Resistors * Capacitors * Inductors * Transformers * Batteries, Fuses, Lamps and Switches * Assessment: Passive Components Semiconductors * Introduction: Semiconductors * Diodes * Transistors ## Transistor Construction ## Transistor Symbols and Connections ## Transistor Operation ## Current flow Model ## Examples: Current Flow Model ## Transistor as a Current Amplifier ## Worksheet: Transistor as a Current Amplifier ## Transistor as a Switch * Logic Gates * Assessment: Semiconductors Passive Circuits * Introduction: Passive Circuits * Series and Parallel Connections * Kirchoff's Laws * Potential and Current Dividers * Passive Time Variant Circuits * Assessment: Passive Circuits Active Circuits * Introduction: Active Circuits * Power Supply Circuits * Operational Amplifier Circuits * Transistor Amplifier Circuits * 555 Timer Circuits * Assessment: Active Circuits Parts Gallery * Introduction: Parts Gallery * Passive Component Images * Semiconductor Images * Other Images * Quizzes |
(:Summary:Contains the 'action' links (like Browse, Edit, History, etc.), placed at the top of the page, see site page actions:) (:comment This page can be somewhat complex to figure out the first time you see it. Its contents are documented at PmWiki.SitePageActions if you need help. :) * Print (:comment (:if group Site,SiteAdmin,Cookbook,Profiles,PmWiki*:) (:comment delete if and ifend to enable backlinks:) * %item rel=nofollow class=backlinks accesskey='$[ak_backlinks]'% [[{*$Name}?action=search&q=link={*$FullName} | $[Backlinks] ]] (:ifend:) :) * Login Transistor Symbols and Connections<^< Transistor Construction | Course Index | Transistor Operation >^>(:nl:)  Whether a transistor uses NPN or PNP construction, its three electrodes are labelled collector, base, and emitter. Note that each junction within the transistor, whether it be collector-base or base-emitter, constitutes a P-N junction - just like a diode. In normal operations, the base-emitter junction is forward biased whilst the collector-base junction is reverse biased. The base region is, however, made very narrow so that carriers are swept across it from emitter to collector and only a relatively small current flows in the base. As an example, the current flowing in the emitter circuit of a small-signal transistor is typically 100 times greater than that flowing in the base. Note that the direction of conventional current flow is from emitter to collector in the case of a PNP transistor, and collector to emitter in the case of an NPN device. (:nl:)(:table style="clear:both":)
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Page last modified on July 22, 2011, at 09:36 AM