ANY ORDERS PLACED ARE ENTIRELY AT YOUR RISK.

NOTE - THIS IS PROVIDED BY THE DESIGNER AS A SELF-BUILD PROJECT FOR HOBBYISTS AND BAT ENTHUSIASTS.

PCBWAY IS NOT AUTHORISED TO ASSEMBLE THESE FOR YOU, AS THERE IS AN EXISTING COMMERCIAL MANUFACTURING PARTNERSHIP IN PLACE.

ANY ASSEMBLY ORDERS WILL BE CANCELLED.

PROJECT FILES UPDATED 15rd April 2025 to use Syntiant Ford 2 microphone due to obsoleting of previous device.

DigiKey shopping list with revised parts : https://www.digikey.co.uk/en/mylists/list/PZM866RLM3

Build cost is now up to £20.50 per device when building 10. This is because the new SD interface is about £1.50 more expensive than the previous version, and the class 1 dielectric capacitors cost a little more as well.

This version of the 3D print file makes a single mount, so if you want to build 10 PCBs, you now need to order 10 (TEN) 3D prints. The 3D prints are under $2 each and are well worth it, they make assembly so much easier. If you have your own 3D printer you can download the STL file below.

The 3D print file with 3.5mm clearance below is to make the device fit into an inexpensive plastic cigarette case for waterproofing - it is not yet tested, I will advise when a test build is done.

UNDER NO CIRCUMSTANCES MAY ANY DEVICES BUILT BE EITHER RESOLD, OR OFFERED FOR SALE. 

THIS PROJECT IS SUPPLIED ON A STRICTLY NON-COMMERCIAL BASIS. I MAKE NO MONEY FROM THIS PROJECT, AND IN RETURN, BY BUYING PCBS HERE, YOU COMMIT TO MAKE NO MONEY FROM THIS PROJECT. 

BE NICE, OK?

NOTE TO PCBWAY ENGINEERS - THIS IS NOT A PANELIZED DESIGN. The area at the top snaps off to allow buyers to build a frame for solder stencil work without wasting PCBs. Please do not charge more than $5.