Diy AMT

[båndsei]

Easy with nitrocellulose thinner.

Bernt

 

[ds23man]

Very interesting technique!

I am investigating how to make a new membrane for a broken B&G RD-50. The problem is I can't make a tonerprint on a 1,25 meter long piece of foil.

 

[ticovski]

Very interesting technique!

I am investigating how to make a new membrane for a broken B&G RD-50. The problem is I can't make a tonerprint on a 1,25 meter long piece of foil.

Long shot but maybe doable... try using linux and open linux driver for printer. Modify driver for continuous printing.

Linux-drivers.org - Linux Hardware Compatibility Lists & Linux Drivers

Just an idea

 

[båndsei]

You can use masking tape.Not too sitcky.:

Bernt

 

[el`Ol]

Maybe it's easier to get small quantitiy samples from a monopoly company that is watching out for new applications.
PEEK Film, Flexible Polymers, High Temperature Plastic

 

[solhaga]

Great idea.
Could you please elaborate on how to proceed with this?

 

[el`Ol]

Someone of the more experienced persons here should do the contact, so they see that he knows what he is talking about.
http://www.rogerscorp.com/index.aspx

 

[solhaga]

Or find out who is the intended user for these materials, for example capacitor manufacturers, and ask for their scrap from the manufacturing process.
Again, it is about knowing whom to contact and that the person that does is "experienced".

 

[båndsei]

The film/foil i got is made for shielding cables etc.

Bernt

 

[solhaga]

Perhaps this is a start then.

But you have probably gone through that list already, Bernt.

 

[båndsei]

Here is my first test of silk screen printing .
I use White plastic paint:

Bernt

 

[båndsei]

Her my latest tests of silk screen with plastic paint:

Plastic paint is remowed with thinner.
I have to test more paint.Acryl for art.

Bernt

 

[solhaga]

It looks like a long road for you to get this right.
I really admire your stamina and determination!

Have you tried to fold and bake any of the new material yet?
It doesn't need to be a perfect circuit or even a complete membran to test if that part of the process works works.

 

[båndsei]

I have been using the oven.For diaphragms and frame:

I made the frame from to pieces of plexiglass 3x6x118mm.
Have to make one more and a magnetsystem.

Bernt

 

[solhaga]

Bernt, you are a true genius!
To make the frame out of plexiglass is supersmart.

Folded and baked membrane looks really great too.

 

[Baldin]

Bernt, that looks utterly briliant ...... wooow you are good.
Can't wait to se the freq and dist measurements ....
So cool

 

[båndsei]

Thank you for all the kind Words.
I have been painting my living room,plastic paint,and have not had the time to Work with the AMT.
I have been fidling with the one I made,and it crackles a bit.Much more than the others I build.
Measurements and listning will show if it sounds distorted.

Bernt

 

[båndsei]

I have tested this one:

Measures like this:

Bernt

 

[tyu]

Vary cool...... thanks for posting the pic.......an info

 

[Baldin]

Hi Bernt
Well you are getting something like 0.3 - 0.5 %THD, which is ok but not excellent.
At what sound preasure level 1m are you measuring?
From the graph it seems that you are not band limiting the input signal .... I was thining whather the crackling noise somes from the pleats touching eachother making for shorts between neighboring voice coil lines .... could it be this?
Maybe bandlimiting the signal from say 500 Hz, might help, and also keeping track on how high volumen you are playing.
Does it also crackle with a filter and music?

Anyway they look stunning.

..... one more ? ..... have you tried a magnet system like the one e.g. Mundorf is using .... essentially two iron plates, with open slots, and some neo magnets between ..... would think them much more efficient
BR Baldin