Martin Simpson
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  • Fremont, CA
  • United States
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Martin Simpson's Discussions

Dual piezo wiring: in series or in parallel?

Started this discussion. Last reply by Paul Craig Feb 12. 15 Replies

I'm working on a license plate resonator guitar with two piezo pick-ups. The piezos are super glued to the back side of the plate, either side of the bridge. This guitar also has a CB Gitty 3 pole,…Continue

 

Martin Simpson's Page

Latest Activity

Paul Craig replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"That's cool and a good idea."
Feb 12
Martin Simpson replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Here's the pictures that I promised. As you can see, it is just quick and dirty construction.  The disks marked P are in parallel and the ones marked S are in series. The toggle switch selects one or the other, or both. When the box is…"
Feb 12
Rob Todd replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"I am just about to put two piezos in my latest build and found your research invaluable. Many thanks."
Feb 11
Paul Craig replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Always remember that sound/tone results vary according to the user. We all have different ideas of what is good or bad. So you get ideas about things, but you have to try them to find out if you like it or not and you may get different results in…"
Jan 17
Martin Simpson replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Now that the build is finished, I have the answer to my own question. The dual piezos wired in parallel are actually louder than the humbucker! If I run the humbucker at full volume, the piezos have to be set at about 2/3 to 3/4 volume to match. Ill…"
Jan 17
Paul Craig replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"The more expensive acoustic preamps have hookups for piezo and magnetic pickups and they add a buffer to the piezo while equaling the impedance mismatch. They can go for several hundred dollars. I have a git with a humbucker and a piezo wired to…"
Jan 14
Tom T replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"An excellent approach to a common question. Your experiment should be helpful to a lot of folks."
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
Martin Simpson replied to gordon barnes's discussion Maduro all wood box, top(thick), or bottom (thin) for sound board? Effect of short vs long scale length on tone
"I think that you have exactly the right idea. You want a nice thin sound board as the top. If the sides of your box are thick then I would put the sound holes there. That will help the thin top act as a diaphragm for moving air/sound."
Dec 28, 2018
Paul Craig replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"The series wiring could be a good thing to have with low output volume amps as long as you use a lot of box shielding and enough insulators between the piezo's and box. Solid body gits might work better with that type of wiring."
Dec 26, 2018
Martin Simpson replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"After thinking about this alot and reading the generous advice above, I decided to build a simple test jig.  I hot glued four jumbo piezo disks to the inside lid of a cigar box. I put them in a square configuration right in the center of the…"
Dec 26, 2018
Cause the Blue rat replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Think of it this way. Series doubles the impedance. Parallel divides it in half. Unfortunately you may not get the same output between the pickup and the piezos. Could turn the pickup volume down a bit to make up for the difference. Let your amp…"
Dec 23, 2018
Paul Craig replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"Tom is right. Wiring in series just magnify's an already bad problem with the impedance. Multiple piezo's should be done in parallel."
Dec 16, 2018
Tom T replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"I read somewhere (maybe on this site) that the Piezo has such high impedence that is has trouble impedence matching with most amps. One way to lower this impedence is to put Piezos in parallel. I've tried this and there does seem to be less amp…"
Dec 8, 2018
BrianQ. replied to Martin Simpson's discussion Dual piezo wiring: in series or in parallel?
"You’ll have to run the piezos through an onboard preamp, FYI, the Fender powerstrat has a similar configuration,good luck"
Dec 5, 2018

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How did you learn about Cigar Box Nation?
Justin Johnson
How many instruments have you built so far?
2
What do you find most interesting about cigar box guitars? (If you do not enter something meaningful here, your membership may be rejected).
I enjoy the "roots" aspect of the music. I think it is underappreciated that you can make great sounding instruments from common objects with rudimentary skills.

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