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Brach,
You got 5 of the LDT0-028K on the way to you via US-POST. The real only vulnerable attribute of these piezo film strips are when you solder them, it’s a good idea to use an alligator clip heatsink on the lead as you solder wire to the terminal so the plastic wont melt. The don’t brake like ceramic elements; they are really tuff.
I pulled these off of some old TV’s to get the VLCD panels; I striped them out as I was recovering the LCD screens. Here is a link to the specs of board they got pulled from:
Click to access SKY-4100_Specification__rev1.1(TV).pdf
They functioned as a vibration detection switch that would turn off the screen if motion was detected. I suspect this was an automotive safety thing to keep the driver from watching the screen when the vehicle was in motion.
Here is another link (on digikey) that shows more of the MEAS products including a shielded version of this piezo filmstrip:
https://www.digikey.com/en/datasheets/te-connectivity-measurement-specialties/te-connectivity-measurement-specialties-piezo_film_guideI have been using 3 of the MEAS CM-01B on a 4-chanel deep memory scope to capture the data; the CM-01B Contact Microphone manual shows the charge circuit used to amplify the circuit; see link:
https://www.te.com/usa-en/product-CAT-PFS0013.html?q=piezo%2Bfilm%2Bguide&source=headerBefore I got my hands on the CM-01B I was using the piezo filmstrips with my DIY logarithmic op-amp based charge circuit to isolate and amplify the signal. The common mode rejection circuit of the Cortado should perform really nicely with these PVDF strips.
The Cortado’s I just ordered will be getting hooked up to a very small portable ZOOM H6 digital recorder that has 4 phantom powered XLR jacks. It would be a huge vantage point having transducers that are elastic rather than ceramic for use on a portable setup that interacts with percussion based Instruments. Their is an obvious single output difference between how the PVDF film works and the ceramic crystal. Hopefully this will become a fun activity on your side when you explore the PVDF behavior.
– Æ.drums
