Technology in audio

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.

Technology

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.

Electronics

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.