silver foil caps for ribbon membrane

[geraldfryjr]

Well, IMO ,go for price per (/) material volume per (/) field strength vs surface area /

I hope I (said that right)

I figured out a formula for capacitors aswell.


farads / voltage / price

The lower the better.

Been a while since I figured that one out
Anyway the most density for the price of course.

stacking them is like putting batteries in series .jer

 

[slr 5000]

i just found a product that may be of interest for making diaphrams
Chemtronics | Workshop Consumables | Adhesives, Sealants and Tapes | PCB Compounds and Adhesives | Conductive Adhesives-PCB Compounds and Adhesives |CW2900

it is a conductive silver paint pen ,it could be used to draw nice tracks on a mylar ribbon from top to bottom instead of glueing aluminium to the maylar

heres another
RS | Workshop Consumables | Adhesives, Sealants and Tapes | PCB Compounds and Adhesives | Conductive Adhesives-PCB Compounds and Adhesives

if conductive enough you could simply lay out your mylar and draw your tracks top to bottom ,it would only work for a segmented ribbon though and i,m not sure how it would hold up to corrigating

cheers sheafer

 

[slr 5000]

heres something that may work
silvaspray

expensive though

 

[geraldfryjr]

The last time I bought one of those pen's was in 1992 for $14.95 from MCM.
The second one was in 1996 for $17.95.
At that time I thought the price was absurd.
Luckely it was still good in 2001 and when I repaired my apogee panel. jer

 

[geraldfryjr]

I still have some nickel print from M.G chemecals that I paid $8.95 a bottle in 2003 from cannada.
shipping was almost double. jer

 

[slr 5000]

hi jer
so how were your results ?

there are many other types of paint i have found now seems like an easy way although getting a pen with a tip of around 5mm may be hard

would work well with say a ribbon of 1.2m long by 50mm wide with say 9
5mm tracks with 1mm spacing between

cheers sheafer

 

[geraldfryjr]

Well, it seems that nothing(likes to) sticks to mylar. jer

 

[geraldfryjr]

Have you not tried this?

 

[slr 5000]

hi jer
yes i have built a couple of esl speakers and there are a few products that stick quite well
polyureathane glue being one of them

one of the silver pens i provided a link to specificly mentions mylar ans flex circuits so i think its workable

longevity is unknown though as the ribbon will constantly be moving

cheers

 

[geraldfryjr]

Oh, Okay. I found that the stuff is very flexible and I have even been able to solder too it but it is very tricky.
I also tried to use it as a base to plate copper .jer

 

[geraldfryjr]

But like I may have said mylar dooes not like any thing.so this is what I did.
mylar ,rubber cement, graphite,copper.

Some where I still have the one I did with 1/16" stripes (using a pc board method) sandwhiched in between some of the .25mil mylar that I still have. jer

 

[geraldfryjr]

I have not yet actualy used any gorilla glue yet for a few reasons ,but I am about to embraqe on the ups and downs of such a product.

I would like to come up with a process to be able to use it without the foaming.

In ESL's the air bubbles can cuase a weakness of the dielectric material in the area that it is tyring to seal from the electric field.
Especialy when you are talking about 27Kv peak to peak across the stators. jer

 

[geraldfryjr]

The other reason is, What does't stick to it?
As this can be a problem when setting up jig's for the construction processes.

Gee, what else haven't I covered about building model air planes?
The covering? jerr

 

[geraldfryjr]

Sorry, I was getting real tired and fell out on that last post. jer

 

[geraldfryjr]

I can't tell if the diference between the N42 and N45 is very much.
The N42 seems to be the better deal. jer

 

[MiiB]

I Denmark sometimes in the 80/90'ies there was a kind of movement building Magnepan Apogee type of speakers...As DIY....
I believe this link holds most of the needed information

Planar Loudspeakers Ribbon Foil Speakers Project, magnetostatic design

 

[geraldfryjr]

I did try using conductive silver paint on some polyester leader tape.
Altough my technique could have been improved it was a rather messy and I wasted quite a bit of it.

It did add considerable mass and when I tried to corragate it ,it just peeled.
It seem be some sort of silcone type base as it was soft and rubbery.

With the plating method with copper, I found it difficult to get a consistent thin coating.
The copper was very pure and brittle and cracked when you looked at funny.
It had surface that resmebled sandpaper I'm sure this had alot to do with the base coating aswell.
Not to mention that it's final mass was to high to be usable.

So I gave up on that idea.

Then I had aquired some aluminized 1/4" mylar ribbon that is used for party decorations.

It also as a high resistance of about 50 ohms to 100 ohms per foot.

I wil have an exact measurement for you tomorow as I have miss placed my meter(it is in the gerage and it is raining).

Because of the resistance factor I have not yet tried it.
I am wondering If using a step up transformer would compensate for this?

Another method (in the back of my mind) would be to electroplate a thin layer of copper on it.
But in the long run there are problems of the copper and aluminium reacting with one another. jer

 

[geraldfryjr]

Here some great threads to read,only a start.
Such a wealth of information and probably an answer for every question one might have, from making transformers and ribbons to magnet types and structures and my favorite,how to calculate effeciency. jer


http://www.diyaudio.com/forums/planars-exotics/50162-another-diy-ribbon-thread.html


http://www.diyaudio.com/forums/plan...-tl-loaded-extremis-hybrid-4.html#post1532031


http://www.diyaudio.com/forums/planars-exotics/130733-diy-ribbon-construction-steele.html


http://www.diyaudio.com/forums/planars-exotics/125791-diy-70-ribbon.html