2. Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky. Educational program: Mechanic - electrician Title of program: Technical training II. class Transistor stage with common base Worked out: Bc. Chumchal Miroslav

3.  Scheme of connection of transistor stage with SB  Recessing drawing  Amplifier with common base  Components specification  Properties of amplifier with SB  Students activities  Control questions Connection of transistor with common base

4. Scheme of connection of transistors stage with SB

5. Recessing drawing

6. Amplifier with common base

7. Components Value T NPN ( BC 548 ) R1 470 R2 10K R3 M1 R4 4K7 C1, C3 1M/16V C2 20M/16V Components specification

8. Quantity Value Input resistance ( R VST ) Very small ( 10 ohm – 10O ohm ) Output resistance ( R VÝST ) Very big ( 100k – 1M ) Voltage amplification ( A U ) Very big ( 100 – 1000 ) Curent amplification ( A I ) none Efficiency amplification ( A P ) small ( 10 – 100 ) Properties of connection of amplifier with SB

9.  Design connection according to scheme on circuit board.  Before soldering of components take their measurements.  Join components with solder and activate the amplifier.  Take measurement of the amplifier. Students practical activities

10.  What value of voltage you can measure out on transistor electrodes ?  How big electric current passing through the circuit ?  Calculate amplification of amplifier Au and compare with connection with SE.  Calculate gain in dB and compare with connection with SE too.  Make an evaluating of your work. Students activities- control questions

11.  Poznáváme Elektroniku I.,Václav Malina, Vydalo nakladatelství KOPP,České Budějovice, 1996  www.google/panwiki.panska.cz/index/prakticky vypočet tranzistorového stupně www.google/panwiki.panska.cz/index/prakticky  Vlastní poznámkový sešit Literature used