However, there are a variety of discs and discs available in the form of metal discs, zirconium oxide discs, and zinc oxide discs. Zirconium oxide discs are the most common form of metal and zirconium oxide discs. There are also disks made in paper, plastic, vinyl, and vinyl corresponding shapes. offers a variety of discs, for example, vinyl rotary discs, mini pizza discs, and pixie discs are all available in all shapes and sizes. There are a variety of shapes and sizes to suit the needs of your customers, and for the all tastes and preferences of their customers. This will give you an appreciation for how cable types, lengths and source impedance values all interact to affect the sound you hear.Iejet discs are made in plastic, vinyl, and recycled plastic. Look up these words on the web “bridging impedance” and “matching impedance”. So, as you can see higher frequencies are subject to more high frequency load but the Schatten mini pre isolates the piezo device from that loading because the output impedance of the mini pre is 3,500 ohms and even at the highest frequency the cable capacitance is over 10 Times higher than the output impedance and it looks like a bridging load on the preamp. The 350 pf cable capacitance looks like this ar various frequencies. Connect your piezo device directly to this preamp/buffer and plug your long guitar cable into the output of the mini pre and you will isolate the piezo device from the amp input loading and the effect of a 10 foot guitar cable having about 350 pico faraday (pf) of capacitance whose reactants (like resistance but at a specified AC frequency). Obtain a Scatten Design mini pre which has a 10 Meg ohm input impedance. If you combine these parallel loads it Looks like a 500 K ohm load to the piezo device. This passive volume control is also in parallel with the input impedance of a typical guitar amp which is about 1 Meg ohms. High impedance transducers like piezo devices have a very high impedance and will get loaded down by using volume controls in the 500K ohm to 1 Meg ohm range. This is by far the coolest hobby I've ever stumbled upon, and since I build them with my 16 year old daughter (the family artist), it's doubly cool. On a related but totally unrelated note, I also built an ES-335 style semi-hollowbody guitar from a kit, but that involved humbucker pickups. ![]() In the following round of builds, I'll start thinking about preamps, pots, wiring a rod and disc in parallel, multiple disc locations, perhaps even active pickups and magnets, and all the other stuff I've been reading about. If I'm going to buy a bunch more and start building more of these as a hobby (which I most certainly am, because I love it so far), I want to make a more educated guess when I buy the next batch. However, I don't recall what the specs were on those first piezo discs I bought, and I may have just made a lucky guess when I bought them. I'm just wondering if there is any sort of general guidance for a quick build that sounds kind of cool when I plug it in in my living room to show a friend or two.įinal note: I have built one CBG with a simple single disc inside-the-box pickup and installed pickups in an acoustic guitar and in a ukulele. I also put a rod piezo in another acoustic guitar. I'm not looking for the highest quality sound or how to finesse it. I will mount it inside the cigar box, probably on the inside of the box top, just under the bridge, favoring the lower/bass string side.ģ. ![]() (Again, I'll get there, but not this round)Ģ. I'm using the simplest single disc to jack pickup with no preamp, pots, external power source or anything else. I'll get there. Right now I'm really looking for beginner-level rough and general guidance for the fifth grader, so assume the following:ġ. I know there are a million directions and a million level to which this type of conversation can go and that a thorough and precise answer probably has to begin with, "Well, it depends." I know that's all important stuff, but I'm not there yet. I don't know which resonant frequency rating is preferable for my purposes. When shopping for Piezo discs, I have seen them of various size discs and ranging from a resonant frequency of 1.9 ±.5kHz to 9.2 ☑kHz, with most being between 4.0 ±.5kHz and 4.6 ±.5kHz. ![]() Q: In a very general sense, what is the optimal resonant frequency for a single disc piezo pickup to be mounted inside the box of a very simple cigar box guitar? So I have a very basic, bottom line type of question: ![]() Much of it was over my head as a beginner, and I've had a hard time finding a rough rule of thumb answer to a more fundamental question about resonant frequency. I have read several discussions and articles about resonant frequency, many of them going pretty deep into the science/engineering of piezoelectrics.
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