Caution - output may go rail to rail Operates on 12VDC. Provides a Gain factor from about 5 to 27 as indicated on the front panel. Piezo mics in guitars or percussion instruments can give hefty peak voltages and low supply voltage possibly does not provide enough room for the signal voltages to swing. This PreAmp is perfect when you want to connect external sources to your Eurorack modular synth - like tape players, microphones, remote piezo pickups and more 4HP width. I have done no calculations, but I'm afraid of increased distortion. The preamp should be totally redesigned for low supply voltage to be sure. This can be good - lower volume makes the sound less bassy and preserves some hearability in the total mix. This is negative loudness: when the balance control decreases the volume, low frequencies get more attenuation. NOTE: It is good to change the 4,7uF capacitor to bigger value, say 47uF because this simple balance control increases the loading and causes attenuation at bass frequencies.
![piezo preamps piezo preamps](http://d3d71ba2asa5oz.cloudfront.net/12026409/images/30042110-1.jpg)
In AliExpress, you can also find other good. The higher is the pot resistance, the less you lose the total volume, but the wider is the dead "no effect" area in the middle. The piezo pickup preamp is a universal, allinone device that connects to your trucks suvs front fork assembly.
![piezo preamps piezo preamps](https://www.emma-music.com/Files/132481/Img/14/p1060586-zx1200.jpg)
Connect 4.7uF cap to the slider and the low volume end connector of the pot to +9Vīalance pot can be a 4700 ohm lin pot between the outputs, connect the slider to GND.
![piezo preamps piezo preamps](https://media.guitarcenter.com/is/image/MMGS7/Piezo-Buffer-Preamp-EQ-for-6100-5600/K19639000000000-00-1200x1200.jpg)
Piezo-one string to string compensation provides true tonal. The saddles are precision machined to provide the lowest action on necks ranging from 10' through 14' fretboard radii. They feature overall compensation and height adjustment screws for precise location. It would be useful not to add the output impedance of the preamp, so replace the 1.5kOhm resistor with the volume pot. Brenner piezo-one saddles allow simple, reversible, no-modification installation to several popular electric guitar types. Common GND, +9V and 10uF decoupling capacitor do well in stereo version Answer: If we’re talking about a piezo pickup for a guitar, rather than for a vinyl turntable needle, or some other application, this one from looks to be among the simplest.