Hello everybody,
I am going to place an order for ePTFE membranes, likely from this company on Alibaba.
Before I email them to get quote in the next couple of days, is there anyone who wants to join this order? I am based in Greece. I will post your part of the order as soon I receive the membranes.
I am likely going to order about 100-200 for myself. I would prefer the black color, but I am ok with switching to white if color is important for other people.
I am also willing to consider other membranes instead of the one mentioned above, if you have good reason to believe they would perform better.
By the way, I am thinking of placing the membrane on the inside surface of the box, and a single layer of 500-mesh woven on the outer side (https://www.inoxia.co.uk/products/mesh/sheets/500-mesh?fbclid=IwAR2HPEDe7WNJ_FHsB8Oh0-7IjJNBM5vUskUnQVJXbaStMNlbyK8to3hvAEc / instead of the 2-layer NicWax treated suggestion mentioned in another post - here ). Would the combination pose a problem? I am recording at 8KHz sampling rate only. I was thinking that the wire mesh would keep insects away (which have poked a hole in one of the two AudioMoths I have tried - see photo below), while also limiting the amount of water that would linger on the lip of the drilled hole - if I had only the membrane on the inside. Any thoughts?
Looking forward to hearing from interested people.
Christos
Hello Sylfest,
Sadly not yet. Parts have been delayed (battery packs I wanted to connect to the AM), so I have not gotten to this point. : (
C.
Hi Christos
Did you try fixing the ePTFE membranes to the inside of the sound hole and the 500-mesh on the outside, and did that work well?
Sylfest
Hello Catherine,
I am afraid I have ordered them already (just 50 samples in the end), and they have arrived. I have not put them to use yet, as I am waiting for the boxes etc.
They look quite different from the one in the photo above - look thicker/more robust. The white one you see in the photo of mine was provided from Andy to test. I have not looked into how the new ones compare with the old ones either.
The product I have ordered is this:
https://www.alibaba.com/product-detail/Customized-IP67-protective-vent-waterproof-acoustic_62076766363.html?spm=a2756.review-list-buyer.0.0.onTIyN
The total cost, incl. shipping to Greece, was 35 USD. The cost of the membranes was 0.20/membrane for up to 50 samples (limit) which adds up to 10 USD. The remaining is the postage fee. It arrived quite quickly.
Christos
Hi Christos,
Not sure if you have already ordered membranes but I would be interested in joining the order. Probably for around 100 pieces. There is another recent forum post who might be interested in joining the order too.
I also had the same issue with holes forming in the membranes and am interested to hear that it was insects! I was a little perplexed.
Also, when I received the membranes in the post last time some already looked a little worn - if you held them up to the light some had a change in transparency across the membrane. Did you experience this too? I had been discussing with the seller to try and identify why this was but haven't got an answer so far.
Thanks,
Catherine