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Old 6th September 2013, 12:22 PM   #11
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by Greebster View Post
Perhaps the membrane needs to be porous similar to the insulating sheets used in lithium ion polymer batteries.
Good idea, I will give that a try. A Gore Tex membrane may be perfect for this. What is a cheaper more readily available substitute? I could just put a bunch of pinpricks on the plastic food wrap - that will act more like distributed point sources rather than an area.
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Old 7th September 2013, 12:49 AM   #12
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Also you have the negative and positive terminals effectively at the same point. this would cause the electron flow to travel the shortest distance between the two. One of the other pics showed a wide ring with one conductor on the inside and the other on the outside. Doing it this way would help force a much more even charge between the two gel 'plates'.
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Old 7th September 2013, 01:38 AM   #13
xrk971 is offline xrk971  United States
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Quote:
Also you have the negative and positive terminals effectively at the same point.
Not sure why you say this?

The gel discs have a conductive "tail" that leads from the main disc. Each one forms the terminal to the electrical input which leads out each side diametrically-opposed and on separate sides of the insulating plastic film.

Click the image to open in full size.

This is exactly the same electrode layout used by the researchers.
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Old 7th September 2013, 01:59 AM   #14
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The charge would be the least at the center and at a maximum at the edges in your setup
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Old 7th September 2013, 04:28 AM   #15
xrk971 is offline xrk971  United States
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The gel is a conductor - why would charge be greater at the perimeter? It's not like metal where electrons flow only on surface. It is an ionic volume conductor - like a flat tank of salt water - there is no charge locality.
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Old 23rd September 2013, 09:20 AM   #16
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This thread really should be cross-referenced to the planar/ESL forum.

I believe the Rice-Kellogg cone loudspeaker has been a 90 year blind alley. Dumb way to make sound. But then maybe the internal combustion engine has been a blind alley too.

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Old 23rd September 2013, 12:29 PM   #17
xrk971 is offline xrk971  United States
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Update: a serious limitation of the agar gel speaker is that it is what is used for culture medium for bacteria and fungi. So without any anti-microbial agents - it becomes a mold science project - yuk. Had to throw it away
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