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Old 28th January 2004, 08:35 AM   #1
Stefano is offline Stefano  Italy
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Default conducting spray

has anyone of you notice of any type of conductive spray for to make a planar speaker?
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Old 28th January 2004, 12:32 PM   #2
Stefano is offline Stefano  Italy
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O.K. i've found it! As anyone of you tried "cramolin emilac"? It's a higly conductive spray for emi isolation, i'll try to use it for make conductive a film for a planar or an electrostatic speaker
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Old 28th January 2004, 12:48 PM   #3
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Hi,

If it's graphite, or something like that, don't use it.

A friend of mine sels MYLAR and coating fluid of ESL's it's not expensive and it works verry wel.

What are you trying to make? an d ESL or an MSL?

Best regards,


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Old 28th January 2004, 01:56 PM   #4
Stefano is offline Stefano  Italy
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No problem, this is very conductive, 0,25 ohm/cmm, and made for being used with plastics, you can find it on the net
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Old 28th January 2004, 02:11 PM   #5
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I think you will find that is too low a resistance to make an electrostatic diaphragm, but too high a resistance to paint tracks on the mylar to make a magnetic planar one.

As far as I know, a high value of surface resistance is required for electrostatic diaphragms.

Chris Morriss.
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Old 28th January 2004, 03:05 PM   #6
SY is offline SY  United States
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You've got two problems:

As Chris says, you need a high surface resistivity to operate in constant charge mode. Antistatic levels of resistivity are appropriate.

The other problem is getting stuff to stick and be stable on the Mylar. That's very, very tricky, and a lot of DIY diaphragms have died young. I made my own PTF coating, but that's not an option for most people, and certainly not if you don't have access to a corona or plasma surface treater for the film. Graphite rubbing seems to be popular and reputed to be reliable.
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Old 28th January 2004, 05:00 PM   #7
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As far as I know, a high value of surface resistance is required for electrostatic diaphragms
You'r 100% right!


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