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Old 13th May 2009, 02:25 AM   #61
Few is offline Few  United States
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Very pretty amp, Wachara C.
Few
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Old 13th May 2009, 07:23 AM   #62
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Quote:
Originally posted by Few
Very pretty amp, Wachara C.
Few
Thank you, Few.

Wachara C.
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Old 13th May 2009, 12:45 PM   #63
Phil47 is offline Phil47  France
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Hello Wachara,

Here is the method I made up for testing the conductive surface of my diaphragms :

Click the image to open in full size.

"Mousse conductrice" is a piece of conductive foam (used to package CMOS chips)
"Luciole néon" is a miniature 60 to 80 volts neon light
"Alim H.T." is a high voltage source (my Fluke model 407, 550 VDC power supply)
+ 2 crocodiles clips and a high value resistor (10 M) for security

Connect the crocodile clip to the copper surface of the diaphragm frame and touch the diaphragm conductive surface with the piece of conductive foam. If the neon lights on with constant intensity at anyplace on the diaphragm surface, then the diaphragm is OK.

Click the image to open in full size.

Click the image to open in full size.

Philippe
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Old 13th May 2009, 02:18 PM   #64
vaughn is offline vaughn  United States
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3 pages in and this thread is already turning in to quite a resource.

Wachara, can I ask where you sourced your mylar from?
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Old 13th May 2009, 02:27 PM   #65
vaughn is offline vaughn  United States
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fwiw I found a supplier of Aquadag in the UK;


http://www.abbey-chemicals.co.uk/ind...products_id=43
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Old 13th May 2009, 04:00 PM   #66
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Hi Philippe,

Thanks so much for sharing your techniques.

I use only a multimeter to measure the resistance of 2 points around 1 inch apart. If it shows any value higher than 1 mega ohm, it's good.

Wachara C.
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Old 13th May 2009, 04:05 PM   #67
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Hi Vaughn,

Do you mean where I get my 1.4 and 0.9 micron mylar from? The link is here: www.indoorspecialties.com . The 1.4 is called Ultrafilm and the 0.9 is SuperUltrafilm.

And thanks for your link.

Wachara C.
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Old 13th May 2009, 04:14 PM   #68
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Philippe,

Could you tell us what material you use to coat the diaphragm? I don't see any color. I guess it's not graphite powder.

I use graphite powder.

Wachara C.
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Old 13th May 2009, 04:21 PM   #69
vaughn is offline vaughn  United States
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Thanks for the mylar link Wachara. I'm not sure of the company I linked to for the Aquadag will ship outside the U.K. or not, but it might be worth a try.

Did you use a second non-stretched diaphragm as Philippe did to protect the diaphragm from moisture? Also, did you use a common two part epoxy to attach the diaphragm?

Matt
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Old 13th May 2009, 04:31 PM   #70
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Hi Matt,

Yes, I did make two outer rings with 11 micron film on them to protect outer sides of the stators from moisture. Without them, my sweat would go through the stator holes and shot circuit with the diaphragm. Thailand is hot.

I use 11 micron film on the outside because I feel that I get too much bass out of the 6 micron mylar diaphragm in the middle. It helps reduce the bass a little. But I might change that in the future.

Wachara C.
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