Building speakers, induction and induced current

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Discussion Overview

The discussion revolves around the construction of a DIY speaker using basic materials, focusing on factors that influence sound output, such as impedance, magnetic flux, and the strength of magnets. Participants explore both theoretical and practical aspects of speaker design.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant describes their experience building a speaker from a cup, wire, and a magnet, noting the low sound output and seeking equations to improve loudness.
  • The same participant expresses interest in understanding the effects of impedance on sound at different frequencies and asks about measuring magnet strength.
  • Another participant suggests looking for DIY speaker resources online, indicating that there may be more specific help available through those channels.
  • A third participant shares a link to an article that may provide useful information related to speaker design.
  • One participant argues that achieving the goal of louder sound does not require complicated equations, suggesting instead to use a more powerful and less massive coil and cone, along with a more massive and powerful magnet.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to improve speaker loudness, with differing opinions on the necessity of complex equations versus simpler modifications to the speaker design.

Contextual Notes

Participants mention various factors affecting sound output, such as coil mass, magnet strength, and impedance, but do not provide detailed definitions or measurements for these concepts. The discussion includes practical experimentation but lacks formal mathematical analysis.

Who May Find This Useful

Individuals interested in DIY electronics, speaker design, and experimental physics may find this discussion relevant.

Porter22
Messages
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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.
 
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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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