Home-made Speaker
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Transcript Home-made Speaker
Home-made Speaker
Group 5: Lau Pui Ying Cindy (8)
Sun Yik Ting Jessica (12)
Tsui Lok Lam Irene (13)
Reason why we make the speaker
Understand the structure of a speaker
Learn more about how it functions
Physical theories
Reusable
Expectations
Clear Sound produced
Adjustable Volume
Separate basso and treble
Special effect
N
Theory
S
Current passes through the coil
N
Under B-field
Fleming’s Left Hand Rule
Magnetic force is produced
Theory
a.c. flows through the
voice coil
Coil's polar orientation
reverses
Voice coil vibrates
Diaphragm vibrates
Sound is produced
1st Product
Improvements - Changes
Coil – arranged more tidily
Paper (on top) –
lighter paper is used
Paper (on top) –
cardboard support
Paper on top is pasted
more firmly
2nd Product (Renewed)
Demonstration
Difficulties
Increase B-field magnet ring
Adjustable volume variable resistor
Amplitude amplifier
N
S
N
Reference
Metacafe - Homemade SPEAKERS
http://www.metacafe.com/watch/719200/h
omemade_speakers/
Metacafe - How to Make a Speaker
http://www.metacafe.com/watch/1541071/
how_to_make_a_speaker/
Question
&
Answer