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I am building my first CBG myself and plan to use a piezo in it as well. The site contains a lot of piezo information which I have been reading up on but have to admit that I am a bit confused by what seems to be conflicting information though it is probably just me.
What I find confusing is the seeming conflict between hard or soft surrounds and attachment methods. Some seem to prefer a hard attachment/surround such as hot glue or gorilla glue. Some seem to prefer a soft attachment/surround like silicone caulk or the rubberized tool dip. The Tesla by Ted Crocker seems to use a hardwood surround coupled with a soft, spongy sticky tape attachment.
So my first question would be, is the attachment method solving one problem and the surround method solving another or are they both addressing the same? For example does a soft attachment reduce the "tinny" sound and a hard surround reduce say the peak output?
Sven, it seems that you are proposing to solve the same problems electronically that are being solved mechanically by one or both of these methods above.
I guess I have some characterizations to do with my own piezo pickup.
Yeah, the films need LOTS of pressure. I can see how sitting a bridge directly on them would achieve that. So on a lid they need to be sandwiched on really tight. I have a couple I haven't been able to use because I can't get enough out of them but will try putting them between bridge and lid. Thanks Randy!
I use the Tillman preamp design with some extra stuff on the input stage to even out the variance in FETs and a trim pot before the output to bring it down a little if necessary. I use 25k pots for tone and volume, 0.047 cap for tone. So far as mounting piezos goes, I've tried a few things, but now I just cut out a circle of ply slightly bigger than the disc, supa-glue the piezo to the underside of the lid in the bridge position (maybe just slightly forward and slightly toward the bass strings), run hot blue around the edge of it and sit the ply circle on top, then run hot glue around the ply edge so the disc is completely sealed off. Quick, easy, sounds good, no feedback.
Using two piezos in parallel will halve your impedance, which can't be a bad thing. Just splice red to red, and black to black.
I prefer the larger size discs because you get a more even response across all strings, but I guess if you use two discs parallel the small ones are fine. Mount them side by side and they cover the whole bridge width.
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