![]() The solid electrode pattern is the most cost effective pattern to be manufactured and therefore results in a less expensive piezoelectric ceramic for the end customer.Īnother common electrode pattern applies to piezoelectric ceramics is the wrap-around electrode pattern. The entire ceramic is then polarized to give it its piezoelectric properties. APC’s solid electrode pattern is applied using a silk screening process to the positive and negative surfaces of the ceramic. The solid electrode pattern is the most common or “standard” electrode pattern that is applied to piezoelectric ceramics manufactured by American Piezo. Upon request, APC will polish the electrodes of a customer's piezoelectric ceramics. APC offers a variety of piezo electrode patterns including: solid, wrap-around, side-tab, insulation band, and bull's-eye patterns.ĪPC can apply customer specific patterns or alternative electrode materials (nickel, gold, etc.). String(35) "a-brief-history-of-piezoelectricity"ĪPC's standard electrode material for piezo discs, rings, and plates is a fired on silver material. String(35) "A Brief History of Piezoelectricity" String(42) "6-aplications-piezoelectricity-in-military" String(50) "6 Applications of Piezoelectricity in the Military" ![]() String(33) "how-to-solder-to-piezo-components" String(52) " How To : Solder to Piezo Components" String(42) "Where Do Piezoelectric Crystals Come From?" The circuit I originally started from had a cap there.String(30) "How Piezoelectric Sensors Work" There's no bypassing on the R3/R4 node to ground. This is also why I switched from a NE5534 to a TL072. Too low and you get the tinny janky noise of cheap clip-on microphones, since all the bass is lost. I found that 10M sounded a good deal better. ![]() Definitely nothing to do with loose connections.īecause this is a piezo disc, they can't be lower than 1M - the higher the better. The clicking / popping starts randomly, even when I'm not touching the instrument or the wires. (I've also dropped it several times while unconnected.) Never a single problem at home. At home, I've bent and twisted the wires and jiggled the jack connector, and bounced the preamp circuit on the floor while connected. I'm positive that all my connections are secure. Viola / violin sound is incredibly sensitive to the mass of the piezo element.Īlso, check that there's nothing weird like an intermittent ground connection. I don't know that I can, but I'll see what I can figure out. Is there any reason why my mandolin does not experience this problem even though it's using the same circuit schematic?Ĭan you do something to make more shielding near your piezo? Is there any reason why it should work normally most of the time but then randomly start clicking incessantly? click1,2,3,4,5,6,7.png: Screenshots of the click waveform in Audacity This crackling wasn't there when we started playing, it was a very clean sound. hiss.wav: Some very quiet hiss/crackling shortly before the clicks started happening. clicks 1.wav and clicks 2.wav: viola preamp started clicking in the middle of the performance, so I only captured these tiny bits as I had to mute it viola.wav: no problems with viola preamp at the start of the performance mandolin.wav: no problems with mandolin audio Relevant files, recorded at a recent performance: ( Gofile.io LINK) Recently, the viola pickup / preamplifier has started clicking at random times even though I've used it over a year now and I keep testing it at home without a problem. The mandolin pickup and preamplifier circuit has been working perfectly for over 2 years now. I've built a phantom-powered piezoelectric preamp for my mandolin and viola.
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