Designed for recording acoustic instruments or special amplification purposes, this self-contained device picks up the sound resonating through a stretched spring and is magnified through isolation and an on-board active phantom-powered microphone preamp. Read more about the inspiration of the design here.
Available as a DIY project, mount the included parts in any enclosure you want. I will include a pre-wired circuit board, XLR microphone jack, spring and hooks, as well as a contact microphone.
Place the box in direct contact with a live instrument (e.g. piano, percussion) or open the lid while the unit is powered and gently pluck/play the spring.
This project includes a pre-existing preamp design by Alex Rice and layout by Zach Poff that is distributed under a Creative Common’s ShareAlike license.
Listen to recorded sounds of a Kalimba percussion instrument:
Transducer: Piezo disc
Required: 48 V phantom power mixing desk or interface