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Educational program: Mechanic - electrician
Title of program: Technical training
II. class
Transistor stage with common base
Worked out: Bc. Chumchal Miroslav
Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002
je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.
Connection of transistor with common base
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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
Scheme of connection of transistors stage with SB
Recessing drawing
Amplifier with common base
Components specification
Components
T
Value
NPN ( BC 548 )
R1
470
R2
10K
R3
M1
R4
4K7
C1, C3
C2
1M/16V
20M/16V
Properties of connection of amplifier with SB
Quantity
Value
Input resistance ( RVST )
Very small
( 10ohm – 10Oohm )
Output resistance ( RVÝST )
Very big
( 100k – 1M )
Voltage amplification ( AU )
Very big
( 100 – 1000 )
Curent amplification
( AI )
Efficiency amplification ( AP )
none
small
( 10 – 100 )
Students practical activities
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 activities- control questions
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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.
Literature used
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Poznáváme Elektroniku I.,Václav Malina, Vydalo nakladatelství KOPP,České
Budějovice, 1996
www.google/panwiki.panska.cz/index/prakticky vypočet tranzistorového
stupně
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