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
"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…"
"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…"
"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.
"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…"
"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."
"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…"
"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."
"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."
"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…"
"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…"
"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…"