Ive searched and only found one reference to PVDF here, but for use in an Ultrasonic app. From what i read it isnt as new as the polymer prices would have you believe, and more than likely its all been done before.
however, It does interest me alot, tbh ever since Audax DIY stuff disappeared, and with it went the piezo bubble tweeter. Granted most lost pressure and eventually died, but still, what an inspired idea!
Id love to get a hold of some PVDF and make a small dipole mid/tweeter, maybe a heil effect pleated affair would even work.
ANyone out there with experience to share, or comments to make on this?
however, It does interest me alot, tbh ever since Audax DIY stuff disappeared, and with it went the piezo bubble tweeter. Granted most lost pressure and eventually died, but still, what an inspired idea!
Id love to get a hold of some PVDF and make a small dipole mid/tweeter, maybe a heil effect pleated affair would even work.
ANyone out there with experience to share, or comments to make on this?
I use polyethylen film, LDPE, for planarspeakers.It is 10 my thick or 0.0095mm.It is used in kitchen for covering food.
Other uses mylar film,it is stronger but rattles more.You can get mylar as thin as 4 my.
Other uses mylar film,it is stronger but rattles more.You can get mylar as thin as 4 my.
Last edited:
Do you mean you want to use the piezoelectric property of the film to produce sound? Would that work at audible frequencies?
Have you seen the price!!!
180mm by 180mm, 110 micron thickness, with gold electrodes on both sides costs £710.
(From Precision Acoustics (PAL) | Homepage )
180mm by 180mm, 110 micron thickness, with gold electrodes on both sides costs £710.
(From Precision Acoustics (PAL) | Homepage )
Whoops, that was for a different material. £225 for PVDF.
You'll need deep pockets to try out the idea then...
You'll need deep pockets to try out the idea then...
and yes
and to those that asked, ....YES i am planning on trying to use a PVDF film to produce AUDIBLE sound 🙄
i have no idea if it is possible though hehe...
and to those that asked, ....YES i am planning on trying to use a PVDF film to produce AUDIBLE sound 🙄
i have no idea if it is possible though hehe...
Yes, the speakers sounded pretty good from the upper midrange on up. The cone lower mid and woofer were a little lacking, IMO.
I believe this is what the highly regarded Gallo speakers are using.
I played with piezo film samples that were available in the 80s and managed to generate sound, but I was in serious "newbie" mode so the experiments didn't go very far. I do believe, though, that diy PVDF tweaters are a very viable alternative to more popular approaches.
Few
I played with piezo film samples that were available in the 80s and managed to generate sound, but I was in serious "newbie" mode so the experiments didn't go very far. I do believe, though, that diy PVDF tweaters are a very viable alternative to more popular approaches.
Few
there is a very old JAES article on pvdf tweeters
as I recall it is necessary to curve the membrane and add a springy backing to convert the transverse piezo motion into relatively linear motion and sound output
thickness mode is hopeless for the small deflection and would require a large bias V to linearize and avoid frequency doubling
there are new copolymer films which can be made to exhibit "giant electrostriction" which gives much larger displacement
as I recall it is necessary to curve the membrane and add a springy backing to convert the transverse piezo motion into relatively linear motion and sound output
thickness mode is hopeless for the small deflection and would require a large bias V to linearize and avoid frequency doubling
there are new copolymer films which can be made to exhibit "giant electrostriction" which gives much larger displacement
- Status
- Not open for further replies.