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# Plotting membrane speakers
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## Overview

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Project for wire plotting of membrane speakers.  for wildcard week in mas.836 2018
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- Sam Calisch
- Elena Chong
- Zijun Wei
- Victoria Shen?
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We will use a custom magnet wire plotting tool for the Zund cutter to plot coils for audio speakers.
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<img src="https://calischs.pages.cba.mit.edu/kiri-tww/img/flatcoil/flatcoil-40awg-small.mp4" width=600px>

<img src="https://calischs.pages.cba.mit.edu/kiri-tww/img/flatcoil/flatcoil-40awg-microscope.jpg" height=250px>
<img src="https://gitlab.cba.mit.edu/calischs/kiri-tww/raw/master/img/flatcoil/flatcoil-cut.jpg" height=250px>

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## Simulation

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Two approaches: Coil-magnet, and coil-coil.

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### Coil-coil

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The coil-coil topology relies on coils to generate all magnetic fields, not just the time varying one.

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<a href='comsol/coil-coil-speaker.mph'>comsol file</a>

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<img src="img/coil-coil-flux.png" height=200px>
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<img src="img/coil-coil-force.png" height=200px>
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### Magnet-coil
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The coil-magnet topology (planar magnetic) is used for some high end headphones.  It can produce significantly more force than coil-coil, even with very thin magnets.

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<a href='comsol/magnet-coil-speaker.mph'>comsol file</a>

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<img src="img/magnet-coil-flux.png" height=300px>
<img src="img/magnet-coil-force.png" height=300px>
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## Links:
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- [Planar magnetic headphones](https://www.innerfidelity.com/content/how-planar-magnetic-headphones-work)
- [Ben Katz's Planar magnetic headphones pt. 1](http://build-its-inprogress.blogspot.com/2017/08/planar-magnetic-headphones-part-1.html)
- [Ben Katz's Planar magnetic headphones pt. 2](http://build-its-inprogress.blogspot.com/2017/09/planar-magnetic-headphones-part-2.html)
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- [Applied Science magnetics video](https://www.youtube.com/watch?v=4UFKl9fULkA)