Building speakers, induction and induced current

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SUMMARY

This discussion focuses on building a DIY speaker using a cup, a coil of wire, and a magnet, connected to a headphone jack. The speaker produces sound, albeit at a low volume. Key factors influencing sound loudness include the coil's mass and power, as well as the magnet's strength. The user seeks equations related to impedance and magnetic flux (Φ) to enhance their speaker's performance and is experimenting with generating AC current by spinning a magnet inside a coil.

PREREQUISITES
  • Understanding of basic electromagnetic principles
  • Knowledge of differential equations
  • Familiarity with impedance in electrical circuits
  • Basic concepts of magnetic flux (Φ)
NEXT STEPS
  • Research the relationship between coil mass and sound output in speakers
  • Study the effects of impedance on audio frequency response
  • Learn how to measure magnetic flux (Φ) using appropriate tools
  • Explore DIY speaker design techniques through online resources and articles
USEFUL FOR

This discussion is beneficial for hobbyists, audio engineers, and anyone interested in DIY electronics and speaker design, particularly those looking to enhance sound quality and performance in homemade speakers.

Porter22
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i made a speaker from a cup, a coil of wire and a magnet. I hooked up both of the ends of the wire to a headphone jack and it works. Albeit very low sound, but it works.

Can you point me in the direction of some equations that will show me the most influential factors on how to make it louder? I've been also looking at impedance and their effect at high and low frequencies. I know my differential equations so lay it on me if you can.

I would like to know more about Φ(flux), too.
How can I measure the strength of a magnet?

I'm playing around with creating small ac current by spinning a motor with a magnet on it inside a coil... pretty simple.
 
Physics news on Phys.org
The search term " DIY speakers" gives lots of hits, both web and YouTube. I bet you can get more specific help from those sources.
 
You don't need complicated equations for your stated goal
more powerful less massive coil and cone
more massive and more powerful magnet
 

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