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Old 11th December 2009, 01:34 AM   #231
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Quote:
Originally Posted by Spasticteapot View Post
Yup.

Has anyone done any measurements?
Hi Spasticteapot,

I have compared mine with Koss and Lafayette headphones, and mine sound better.

You don't have to trust me though.

Wachara C.
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Old 11th December 2009, 02:51 PM   #232
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Hi Graeme UK,

I think the .00025" Mylar is suitable. It should be equivalent to 6 micron Mylar. I have tried it, and I liked it.

I'm not sure about the metalized diaphragm. However, you need to make the diaphragm to very slightly conductive. With metalized diaphragm, I'm not sure if it will be too conductive though. High resistance value on diaphragm surface is good.

Wachara C.
Thanks.

I started gatehring materials today, got materials for stators and cups.
Ill order the mylar and some graphite powder, just need to decide on spacer material now.

Any suggestions?

Ill re-read the thread too, see if its already meen mentioned.

Before i start, i was planning on panels that are just under 3" diameter circles. Will these be big enough?
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Old 11th December 2009, 03:31 PM   #233
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Looking around i think i may be better off making them bigger than 3" circle.
I can do 4" circle, just means making new cans.

As for spacers, what about plasticard? The white styrene plastic sheet used in model making, it comes in 0.5mm.

Been looking for something cheap i can use for diaphrams just to test things out. Ill buy mylar when i know it will work.

I have no reference for how thin this stuff is though, how does it compare say to the plastic wrap on cigarettes?
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Old 11th December 2009, 04:09 PM   #234
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Has anyone here tried using really large diaphragms? I have some 4.5" aluminum tube I'd like to use to try and make some headphones.
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Old 12th December 2009, 02:03 AM   #235
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Quote:
Originally Posted by graeme uk View Post
Looking around i think i may be better off making them bigger than 3" circle.
I can do 4" circle, just means making new cans.

As for spacers, what about plasticard? The white styrene plastic sheet used in model making, it comes in 0.5mm.

Been looking for something cheap i can use for diaphrams just to test things out. Ill buy mylar when i know it will work.

I have no reference for how thin this stuff is though, how does it compare say to the plastic wrap on cigarettes?
Hi Grame Uk,

I'm sure that either 3" or 4" circle will do fine. However, using larger stator means that you need to use thicker spacer also. Your suggested 0.5 mm spacer will probably be too thin, unless you want to tension your diaphragm with very high force. For my design, I use 1 mm spacer. The reason why I use it because it's easier for me to work with. With 1 mm spacer, I use a bias voltage of around 620V. It works out well for me.

Wachara C.
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Old 12th December 2009, 03:02 AM   #236
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Originally Posted by Spasticteapot View Post
Has anyone here tried using really large diaphragms? I have some 4.5" aluminum tube I'd like to use to try and make some headphones.
Try it! You might end up with a pair of nice little desktop speakers.

Wachara C.
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Old 12th December 2009, 12:15 PM   #237
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Originally Posted by chinsettawong View Post
Hi Grame Uk,

I'm sure that either 3" or 4" circle will do fine. However, using larger stator means that you need to use thicker spacer also. Your suggested 0.5 mm spacer will probably be too thin, unless you want to tension your diaphragm with very high force. For my design, I use 1 mm spacer. The reason why I use it because it's easier for me to work with. With 1 mm spacer, I use a bias voltage of around 620V. It works out well for me.

Wachara C.
Ok thanks.

Been thinking of making a die cut stamp for makign lots of spacers.

I also canibalised our microwave for the door grill so i can try that, and copper clad board.

Ill order the mylar on monday and get some thicker material for spacers. I have something 0.7mm, might try that as these are only going to be a 'test version' to start with.

I want to add outer diaphrams if possible to keep out dust etc. I see some people do that. Does it effect sound much?
Can i use the same mylar as the working diaphram?
Does it matter how far away from the stators the outer diaphram is? Obviously not 1"

Thanks.
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Old 12th December 2009, 12:37 PM   #238
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Hi Graeme Uk,

If you just want to try out first, you can try the kitchen plastic wrap. You will be surprise how good it sounds.

Yes, I also put an outer diaphragm for dust and sweat protection. I think it is a must especially for the side that will be against your face. My outer diaphragm is only 1 mm from the stator. I use the same diaphragm material for this outer diaphragm as well. The sound difference between having or not having this outer diaphragm is very little.

Wachara C.
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Old 12th December 2009, 05:47 PM   #239
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Great, thanks.

Ill get my stators cut out on tuesday then start a new thread and post up pics.
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Old 13th December 2009, 07:34 PM   #240
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been looking around for mylar in the UK.

I can get the 0.00025 (thats about 6 micron right?), or i can get 3 micron from one thing audio who re-build quad ESL's.

Will 3 micron be ok for headphones?

It works out more economical too as i'd have load left for futer speaker projects
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