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Anglicky v odbornch pedmtech"Support of teaching technical subjects in EnglishTutorial: Mechanic - electrician

Topic: Technical training II. class Transistors 3Prepared by: Melichak Lubomr

Projekt Anglicky v odbornch pedmtech, CZ.1.07/1.3.09/04.0002je spolufinancovn Evropskm socilnm fondem a sttnm rozpotem esk republiky.BIPOLAR TRANSISTOR- is a three-layer component comprised of various subsidized areas- emitter is, in contrast to the base, by several orders of magnitude more subsidized, has much more free charge carrier (NPN transistor with a common emitter) electrons, and they flood a thin area base- increase the positive voltage between the base and emitter thinning area without free carriers at the interface base and emitter- voltage around 0.6 V to 0.7 V (Si) starts PN junction base-emitter leading the electric current. This part of the transistor behaves as a classical semiconductor diode.- applying a positive voltage between the collector and emitter, the excess electrons will be extracted from the base toward the collector.TRANSISTORS 3

Conditions for correct operation of the transistor are :- A thin layer of base - the essence of the phenomenon of transistor.- emitter doped more than base- base doped more than the collector- in bipolar transistor lead current also holes- Therefore, this type of transistor is called "bipolar".TRANSISTORS 3

3Basic connection

Involvement of transistor amplifier with a common emitter.TRANSISTORS 3

4In electronic circuits there can be a transistor connected four basic ways. According to the electrodes, which is common for input and output signal with a distinctive involvement:Involvement of a common emitter (SE) - reverse phase, current and voltage gain is much greater than 1

TRANSISTORS 3

5Involvement of the common base (SB) - non-reverse stage, a small current gain (Ai