Bryan Pieper
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Bryan Pieper's Discussions

Signal strength: Wiring a disc and rod piezo together

Started this discussion. Last reply by Paul Craig Jan 14. 15 Replies

I have wired a disc piezo and a rod piezo in parallel through a simple active (9V) endpin Jack preamp. I tested it before installing, by tapping them on the table. The disc piezo cane through strong.…Continue

Connecting rod and disc piezos

Started this discussion. Last reply by darryl kernaghan Oct 28, 2017. 4 Replies

I have a 3 disc transducer set that combine to one wire that then are soldered to a 1/4” jack. I have a rod piezo that connects (vis 2.5mm plug) to a 3 band active preamp (with a 9 volt battery),…Continue

Piezo disc transducer spec question

Started this discussion. Last reply by Paul Craig Oct 28, 2017. 19 Replies

I have read several discussions and articles about resonant frequency, many of them going pretty deep into the science/engineering of piezoelectrics. Much of it was over my head as a beginner, and…Continue

Tags: frequency, resonant, transducers, disc, Piezo

 

Bryan Pieper's Page

Latest Activity

Paul Craig replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"A blend pot would be an excellent idea."
Jan 14
JL replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"If you connect the rod and disk in parallel, any signal created by one travels not only down to the volume pot but also backwards up the other's wire. think of one as a 12v battery and the other as a 6v battery. "
Jan 14
Bryan Pieper replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Very cool that you did that experiment. I would love to do more of that sort of thing, mixing and matching 100 combos of pickups to see what happens, but I already have too little time for building without venturing too far off the beaten path."
Jan 14
Bryan Pieper replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Yep. Wiring in series increases impedance, which is already an issue with piezos. Wiring piezos in parallel reduces impedance, which is good, but I have heard it also causes a loss of signal, which is bad if you are trying to get the piezos to match…"
Jan 14
Bryan Pieper replied to Tim Castagnola's discussion Fret board Length
"I’m not sure if this is what you are asking, but you can figure out the new fret positions with the new scale length using some online fret calculators. Here’s one. https://www.stewmac.com/FretCalculator"
Jan 14
Bryan Pieper replied to Scott Leonard's discussion Ukulele Advice Needed
"I agree with Tom and Taffy. I definitely recommend studying up on f holes. They can make a big difference. More wood will reduce vibration, so I agree about making the bridge higher, but not filling in the entire space with a shim. Plus, it’s…"
Jan 14
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"Thanks for everyone’s helpful feedback."
Jan 14
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"That’s a great idea. I will attach the disc piezo all the way up at the neck and body junction. Also, I didn’t really factor in the fact that rod piezos are made to function under compression, not merely vibration. When I tested them, I…"
Jan 14
Paul Craig replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"The piezo elements used in the Rod type piezo is of a different type. They have less output and less sensitivity than the larger round piezo type."
Jan 13
Paul Craig replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"Correct. The string vibration will be stronger at the bridge area and the rod needs to be under string pressure at the bridge. So you'll be lessening the output for the disc at the neck area and giving the rod piezo the most exposure to try and…"
Jan 13
Timothy Hunter replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"partly because the vibrations at the neck would be less than the bridge but mainly because these rods are supposed to be under compression, directly under the bridge piece."
Jan 12
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"Correcting a typo: “I don’t see how the electrical signal generated at the end of one branch of the “Y” (the end of the ROD piezo branch). . .”"
Jan 12
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"I’m not sure I follow you about the resistors, but having th tripple-checked and built it twice, swapping out for a new rod the second time, I am confident I have no shorts, bad solder joints, or Reversed polarities. Since the piezos on each…"
Jan 12
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"I thought about the fact that the rod is really several piezo wired in series, but I can’t see how that would cause the rod to be quieter than the disc. After the signal leaves the rod (via the hookup wire in your diagram), the hookup wires…"
Jan 12
Bryan Pieper replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"This is what I suspected: That discs simply have more output than rods. Why would putting the disc piezo in the neck area give them a more equal performance? Is that because there is less vibration in the neck (where the disc would be) than in the…"
Jan 12
Paul Craig replied to Bryan Pieper's discussion Signal strength: Wiring a disc and rod piezo together
"Rod Piezo's have less output than the round disc type which is why most people use a preamp with the rod piezo. Rod piezo's have less handling noise and less attitude that gives them better acoustic tone. You could put the round disc piezo…"
Jan 11

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How did you learn about Cigar Box Nation?
Online search
How many instruments have you built so far?
5
What do you find most interesting about cigar box guitars? (If you do not enter something meaningful here, your membership may be rejected).
After 20+ years as an attorney, starting to build guitars, canjos, mountain dulcimers, and CBGs as a hobby has allowed me to satisfy the natural desire to build something with my hands. Building musical instruments engages my mind and creativity, but in a tactile way that results in the satisfaction of a physical product that combines physics, craftsmanship, visual art, and music.

It has also broadened my musical tastes, as I appreciate certain genres more now that I know a bit more about the craft and the science behind the instruments.

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Comment Wall (5 comments)

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At 3:59pm on November 29, 2017, jawbone said…

Hey Bryan - I think I tried to lead you astray....wire your piezo's in PARALLEL to calm them down - it's been so long I got mixed up.
I wire my speakers in series to double up on the impedence.

At 9:00pm on November 28, 2017, jawbone said…

Hey Bryan - I just saw your message - Wow, I haven't used piezos for a long time - I would wire the piezos in series because it seems to take the harshness out of them. I would usually glue the disc to the back of the neck inside the box. It's purpose was mostly just to calm down the rod, which did most of the work.

At 2:55pm on October 30, 2017, Andries D. EKER said…

\uap>Hi i see you like dulcimers here you see my holes on the teardrop dulci i made ! thanks for the comments and greeeeettsszz !A .D

At 2:51pm on October 30, 2017, Andries D. EKER said…

At 2:49pm on October 30, 2017, Andries D. EKER said…

Hi there Bryan ! thanks for the like & comments on my f holes, been doing them for some time now and the give a nice box this exstra swave thing i think and they are not that gard to do(i think) you findsome nice examples anywhere  copy them on paper in the size you need, rub some charkkole on the bottom place them even on the box( think about left &right) draw them over whit a ballpointpen, so the charkkole rubs of on the box, drill small holes on the end points of the f holes, and you are ready to start cutting whit a saw, i use

 
 
 

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