BREAKING NEWS !!!!
Soft AMT
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Diaphragm 32x80x10mm.
Made from PVDC film and alu with paper, and spray glue
Have not measured freq responce yet.
Beat this :Res freq. 130 Hz.
Bernt
The PVDC is this like saran ? The sticky stuff? Since most Cling film Now is PE.
Did you leave the paper on ?
Hmm not sticky, may i ask where you got it ? Only pvdc I could find was the original Saran +- 12 micron
Thermosetting is a problem I guess Saran shrinks a considerable amount as far as I know.
Last question what spray glue did you use ? I noticed that different brands work really different some need coating on both materials witch is not preferred , and some don't spray even and some are rather thick
Thermosetting is a problem I guess Saran shrinks a considerable amount as far as I know.
Last question what spray glue did you use ? I noticed that different brands work really different some need coating on both materials witch is not preferred , and some don't spray even and some are rather thick
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Well I'm on different projects, I launched 4 at the same time, 2 on headphones and 2 on audio drivers of a special type... As a result : none improvement !...
Anyway, I'm not in a hurry !
PS : I did a try with diaphragms ordered at Parts Express, but I didn't really enjoyed the result...
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Here some measurements
SPL is not calibrated to 2,8v1m.
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100cm dist.
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10cm dist.
I have tested ess diaphragms too.No succes either.
Spray is applied in a thin layer.It is a low price no name.
Film is for microwave oven.
Bernt
well bandsei that looks promising!. 80x31 is very small so very very good result. is the pleat width still 1 mm?
the pictures are a bit small but if i see correct high freq drops like a brick at 16khz ? or a bit higher i cant see the last frequency in the measurements
making pleat depth 8 mm will result in a better high end. ofc also higher res but a res of 250Hz would still be awesome for such small panel. or its the weight that limits that, but it looks more like pleat depth or both.and the low end does not even drop that hard. i can imagine 120mm will increase the low end output to.
well nice finding i think. do you like the result sound wise ?
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well i got me some microwave stuff as well, it has a sort of brownish tint. it does not stick.
but nowhere it stated it is PVDC the cheaper products cling/microwave film was PE.
you got a brand ? or is it a typical local brand
btw you must have a massive amount of films in the supermarket al this nice alu/paper stuff and such PVDC etc i am living in the wrong country
but nowhere it stated it is PVDC
the cheaper products cling/microwave film was PE.you got a brand ? or is it a typical local brand
btw you must have a massive amount of films in the supermarket
al this nice alu/paper stuff and such PVDC etc i am living in the wrong country
looking good!
this low for such small driver is insane..i can imagine they sound impressive, i found on my film the PP logo so no luck with the PVDC
i tried it but its tooooooo fragile. i now tried just for fun Alu paper Alu. i etch one side and leave one aluminium and paper. just for fun since i wondered how paper would sound.
maybe could do a doable coil
this low for such small driver is insane..i can imagine they sound impressive, i found on my film the PP logo
so no luck with the PVDC i tried it but its tooooooo fragile. i now tried just for fun Alu paper Alu. i etch one side and leave one aluminium and paper. just for fun since i wondered how paper would sound.
maybe could do a doable coil
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Oh Bandsei, you used the 7 micron alu/paper you once send me ? so the paper is only on the AL traces ? you removed the rest material?
paper does not work... at least not my paper it was to thick might try your recepy , although my method of getting traces is different so i cant remove the rest material from the paper/alu
paper does not work... at least not my paper it was to thick
might try your recepy , although my method of getting traces is different so i cant remove the rest material from the paper/alu
From Wikipedia I saw that Saran Wrap is no longer made of PVDC:
"However, today's Saran Wrap is no longer composed of PVDC, supposedly due to environmental concerns with halogenated materials, and is now made from ordinary polyethylene."
So one better to look out for the PVDC label.
It is not Thermoset, in fact when heated above 125 °C it dissolves into HCl!
I think it is feasible though to have retainers every 80 mm or so in order to maintain the folds.
I used 10my alu/paper.
Traces are cut with my silhuette cutter.
Paper is only on the traces
If you look at my pictures here:https://plus.google.com/u/1/115027702649442747143/posts/N7DUh3pxgBP?pid=6099337220329919698&oid=115027702649442747143 Picture 102 to 111.
You can se how I used to print on the paperside and cut with a double knive 2,5mm traces ,tape cuts and glue it to the mylar film or pvdc film, remove tape and evt. paper.
Solhaga I think you are right regarding the retainers.
I will make the diaphragm 160mm high, test it ,and evt. make retainer.
Bernt
Traces are cut with my silhuette cutter.
Paper is only on the traces
If you look at my pictures here:https://plus.google.com/u/1/115027702649442747143/posts/N7DUh3pxgBP?pid=6099337220329919698&oid=115027702649442747143 Picture 102 to 111.
You can se how I used to print on the paperside and cut with a double knive 2,5mm traces ,tape cuts and glue it to the mylar film or pvdc film, remove tape and evt. paper.
Solhaga I think you are right regarding the retainers.
I will make the diaphragm 160mm high, test it ,and evt. make retainer.
Bernt
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Have you considered to remove the paper?
When I made ribbons, I used 3M 77 on bare aluminium strips and then applied the mylar.
Regarding retainers, one idea is actually to use the 74 film instead of aluminium strips across. I don't know if the PVDC will withstand the baking temperature though.
When I made ribbons, I used 3M 77 on bare aluminium strips and then applied the mylar.
Regarding retainers, one idea is actually to use the 74 film instead of aluminium strips across. I don't know if the PVDC will withstand the baking temperature though.
If the Alu strips are outside the gap it should work and not add anything. Especially if you use glue to set the folds anyways. But since once side the foil is already almost touching each other I recon retainers every 60 or 70 mm would be better. Maybe the middle retainer is indeed more useful to use the tape or anything else that could've heat set . If pvdc could handle it of course . The top and bottom retainers can be of any material that holds shape.
Ok, so it was by choice and not necessity that you left the paper on then.
I was just curious, don't mind about me - carry on!
Bernt,
Did you try to do the tracks with a "conductive mixture" (i.e. the so called conductive ink) instead of aluminum and/or other material strips ?
Is there an intensity issue for you ?
I made some trials with conductive ink or glue and it seems that it works but I never try to write on Mylar yet.
What is your opinion ?
Did you try to do the tracks with a "conductive mixture" (i.e. the so called conductive ink) instead of aluminum and/or other material strips ?
Is there an intensity issue for you ?
I made some trials with conductive ink or glue and it seems that it works but I never try to write on Mylar yet.
What is your opinion ?
I have not tried conductive ink.
I have the silhouette cutter to make my traces.
I have just tried to make a diaphragm with PVDC film ,alu and no paper.
Too soft.Tried to bake it at 170 dg. No way.
Now i am going to laminate 3m tape with alu/paper, remove the paper, cut traces,and laminate with PVDC.
This way there is only the soft PVDC in the "hinges".
Bernt
I have the silhouette cutter to make my traces.
I have just tried to make a diaphragm with PVDC film ,alu and no paper.
Too soft.Tried to bake it at 170 dg. No way.
Now i am going to laminate 3m tape with alu/paper, remove the paper, cut traces,and laminate with PVDC.
This way there is only the soft PVDC in the "hinges".
Bernt
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