I soldered on a short piece of shielded cable with a 1/4 phono plug and then wrapped the square of laminate in copper shielding foil, letting the conductive adhesive contact the ground.
Connecting the piezo discs in parallel halves the output impedance, which might account for the good frequency response. It also could be that the two discs pick up a more representative sample of the soundboard vibrations, but they're not very far apart. Having two discs wired in parallel cuts the signal too, so I needed to add some more gain from the preamp.
Below is a sample recorded with the pickup taped behind the bridge of my nylon string guitar. The selection is my attempt at Beck's version of Skip James' Jesus is a Mighty Good Leader. The sound has an odd muffled quality, but overall is good. I may try three discs next.
He's a Mighty Good Leader
3 comments:
I find that there is something alluring about the sound from the latest sample. The sound is familiar. I am waiting at the end for the "this is NPR" and you have been listening to Garrison Keillor.
If you find Garrison Keillor alluring you probably should remain anonymous.
I'm glad someone thinks I'm alluring.
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