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Friday, February 22, 2013

Technology in audio

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Technology in audio
 THE MOST POPULAR CONFIGURATION - COMMON EMITTER MODE
Common emitter mode has
High input impedance
High current gain
High power gain

Amplifier - amplifies electrical signal
Passive components - R, L AND C, transformer
Active components - diode, transistor
In amplifier - passive components fix operating point (dc level) and couple the various stages.
Important parameters of an amplifier:
Input impedance
Output impedance
Current gain
Voltage gain
Power gain

A good amplifier has
High input impedance
Low output impedance
High current gain
High power gain.

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Technology

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Technology
Transistor has three layers of N and P.  ((NPN OR PNP),
Terminals of transistor: collector, base and emitter.
Emitter layer emits electrons: it is heavily doped.
Base layer is lightly doped-thickness 10.6m
Collector layer collects electrons: size is large - dissipates large power.
For the operation of a transistor - base - emitter junction is forward biased.
Collector - base junction is reverse biased.
Collector current, 1 c = emitter current, 1e.
THREE CONFIGURATION OF TRANSISTOR OPERATION.
COMMON BASE
COMMON EMITTER
COMMON COLLECTOR.

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Electronics

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Electronics deals with flow of electrons through vacuum, gas or semiconductor.
Electron devices - vacuum tubes, gas filled tubes, semi conductor diodes, transistors etc.
electron devices - used in rectifier , amplifier, oscillator etc.
semiconductor materials - silicon and germanium
advantages s solid state devices
. Small in size
.  More efficient
.  Cheap.
Types of semiconductor: n type and p type
diode has two layers of n and p.
terminals of diode: anode and cathode.

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