Electronics > Projects, Designs, and Technical Stuff
Piezo Sounders - mounting under a decal?
<< < (3/4) > >>
Benta:

--- Quote from: Simon on January 10, 2019, 03:54:41 pm ---Some how I think a decal like that will be expensive unless made in serious volumes and large batches at a time.

--- End quote ---

I don't think so. Decals are made like PCBs at the same cost point.  And conductive adhesive is no magic nowadays. For 1 kpcs. it'll be reasonable.

But let's see what max_torque finds.
Wendy_Preston:

--- Quote from: Simon on January 10, 2019, 12:50:32 pm ---As Wendy only has 4 posts at this time she has obviously only just joined and I expect ran a search on "Harwin" to see if their products are being mentioned and if she can offer any help.

--- End quote ---

You got it in one :) Not here to push Harwin specifically - although I will mention our products if I think they might help with a solution. Doesn't mean you have to buy it - it might just get someone thinking on an alternative track. Other manufacturer's products are available.  ;D  But definitely want to help if someone mentions issues with Harwin products.

I promise to be helpful and not pushy - I'm an engineer too, didn't do too well when I tried Sales  :-[  We just thought in the Marketing Team here that I might be able to contribute, rather than just wait for support requests to come in my email and Live Chat.
JVR:

--- Quote from: Simon on January 10, 2019, 03:54:41 pm ---Some how I think a decal like that will be expensive unless made in serious volumes and large batches at a time.

--- End quote ---

We got the above solution built at ~$12 ea IIRC, with CMYK printing, 1 button and a few RGB LED's all integrated into the decal.
Simon:
but are you talking the type of decal that has buttons and OLED lights in it? they are not too expensive but there is tooling.
Psi:
It's notoriously difficult to model the behavior of a mounted piezo.
Often the math says X should be loud but in reality it's not.
And a random mounting idea turns out to be amazing.

Ya really just have to resort to trial and error to see what works and what doesn't.

Also, pro tip for using piezos,
Always put a cap in series if your piezo will otherwise have DC on it. You can spec the cap to be low resistance at your drive frequency.
Usually you drive piezos differentially, alternating the polarity around to make the freq you want, but in a two state system this means it has voltage across it when not in use.
Piezos will often partially fail and go from >1Mohms to as low as 2k.
Depending how you have it wired up this can cause idle current flow and be really bad in a battery powered device.

I recommend using a piezo drive IC, you can get them that run from 3.3V and do a capacitive voltage boost to 10V to drive the piezo. This gives you 20V of deflection so really good volume. The chips also ususally have some way to enable/disable each voltage boost stage for simple GPIO 3level volume control
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod