Ralf's Piezo-Amp

Preparing the Piezo-disc with cable and plug

From Richard Lerman, https://sonicjourneys.com/

Was würde Uwe tun? Optimized values und minor changes

• 1M voltage divider and smaller cap
• diodes both to GND, limit input voltages

Download handout: File:PiezoAmp 1channel V2 2.pdf

updated schematics

Mask

Stereo-Piezo Wurmophon - Dual Channel Piezo-Amp

First experiments

Testing the Wurmophon in a compost bin

Testing the Wurmophon in the archipelago beyond Kemiösaari, FI

Working on a new design for a DIY workshop to make a dual channel Piezo-Amp optimized for minimum parts and easy to solder during a short workshop. Also changing to low power op-amp such as the MCP6002, so we can power it from a recharchable 3.7V LiPo or 5V powerbank.

Version 0.5 working

Schematic 0.5

Download full schematic: File:Stereo PiezoAmp schematic.pdf

Full docu, kicad and github

Parts Placement - Handout

Mask

Version 0.5

Reworked, rounded tracks and new labels

github

coming soon...

Older Versions

Ralf's Single Channel

Our good friend Ralf (http://www.ralfschreiber.com/) has shown us his nice new workshop module for making a single channel piezo pre-amp during HOME MADE 2020.

Some discussion on how to use a linear pot that reacts logarithmically by adding / chaning one of the resistors?

Boards

Masks

Schematic

Extra Puffer for Batterie and DC-Power supplier

> bei batteriebetrieb noch  100uF-470uF elko als puffer,

> bei netzteilbetrieb  mindesten ein rc glied R10/220uf dazu!

Other Op-Amps for lower supply Voltages

MCP6002, MCP602, TLC272, LMV358, TLV9002

reworked by dusjagr Single Channel

• Minor changes
• optimized for SMD components
• mini-Jack and Pot on PCB

Optional changes to some values

Masks

SMD 3-Channel Version with Hammond case

coming soon...

Working on github: https://github.com/sgmk/3Channel-PiezoAmp

More about Piezo Amps

https://sound-au.com/project202.htm

Experiments during ROSA

Videos by Richard Lerman Richard Lerman

What is a charge amplifier and why do I need one?