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Permalink Reply by Jerry Jordan on June 21, 2018 at 8:48am

Great stuff CTBR .,.,love to see this experimentation.,.,piezo's and coils are definitely different animals.,.,like comparing rocks to marshmallows.,.,I have a few builds using piezo's that don't mind distortion..,most do howl if you turn it up.,.,i'll give this a try.,.,keep up the good work!!

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Permalink Reply by JL on June 22, 2018 at 3:57am

Piezo crystals do have an 'orientation' (first pic).  compression drives a charge one way, tension (stretching) drives the charge the other way.

by flipping a second piezo one gets compression while the other gets tension, they throw opposite charges (one gives off the red line, the other gives off the blue line.  +1 and -1 at the same time result in the green line compared to ground.

It won't cure feedback, but then neither does a hummbucker. 

A hummbucker kills outside RF noise that the coils pick up as though they were the UHF antennas on an old analog TV set.  Because one coil is wound backwards from the other, the RF antenna effect of one is opposite the other and they cancel.  the magnets don't have any effect on the coil acting as an antenna to outside RF noise. 

but by flipping the magnet in the reverse wound coil, they add together when responding to the sting vibration. one sees the string coming at the N pole and generates a clockwise charge, the other one see the string coming at the S pole and generates a counterclockwise charge.  so you chain the second coil backwards to the first to catch that backwards charge from the backwards side at the same time the other is getting a forwards charge, and they add up.

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Permalink Reply by Taffy Evans on June 22, 2018 at 10:24am

Yep, that all makes sense, I didn't know about the piezo orientation part though. 

Taff

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Permalink Reply by Cause the Blue rat on June 22, 2018 at 9:28pm

Thanks JL. Totally dig the piezo info. So I was on to something by turning one upside down.

I really haven't stopped experimenting. Did something really stupid. Didn't realize just how dumb till I plugged it in. Wired two piezo in parallel to a volume pot. Wired a third piezo in backward, Sending it's hot to ground and black to the input. What I did was have a volume pot that was always on......: ) A piezo blend pot if you will.           

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