DIY piezo preamp, electrify your acoustic instrument

Acoustic instruments can be amplified by using piezoelectric disks which are cheap and cover a good spectrum of frequencies, especially if you use two of different diameters.
The piezo has high impedance and doesn't sound good with most pedals and music gears. It is important to build a preamplifier which acts as a voltage follower, it isolates the two loops and change the overall impedance to a more standard line in input.
Piezo microphones have impedance from 3 to 10 mega Ohms which causes the signal distort.
In this video we test different configurations for piezo preamp and we come with a stand alone preamp powered by usb-c supply.
Compared to the previous preamp we use this time a dual powered preamplifier which compared to the previous one using a resistor partitor sounds much better.
The violin is used to create a soundtrack with zoom g1 four effect pedal and novation circuit for the base.

Moments:
00:00 pedal buzz
00:40 existing projects
01:00 on breadboard
02:00 theory
04:50 on perfboard
06:00 building the box
08:00 live test
08:40 sound test

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