2. Tutorial: Mechanic - electrician Topic: Technical training II. class Transistors 3 Prepared by: Melichařík Lubomír Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

3.  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.

4.  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".

5.  Basic connection  Involvement of transistor amplifier with a common emitter.

6.  In 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

7.  Involvement of the common base (SB) - non- reverse stage, a small current gain (Ai<1), very low input impedance, high voltage gain (similar size as that of SE), in connection with the use of switches or sources in part stabilization.

8.  Involvement of the common collector (SC) (=Emitter follower) - non-reverse phase, a large input impedance, large current gain, voltage gain is less (<1), is used in monitoring the circuit.

9.  1. Name the basic properties of the bipolar transistor.  2. Name the basic conditions for the proper functioning of the transistor.

10.  1. Draw the circuit diagram of transistor amplifier with a common emitter.  2. Draw the circuit diagram of the transistor with a common emitter (SE).  3. Draw the circuit diagram of a transistor with a common base (SB).  4. Draw a connection transistor with a common-collector (SC).

11.  Václav MalinaPoznáváme elektroniku I.  Adrian Schommers Elektronika tajemství zbavená. ISBN 3-92608-32-5