Simple Bluetooth Speaker Project
"Pop Drop" speaker charges via USB port.
Homemade "shorty" gondola sized especially for this speaker
Gondola sized to be as small as possible, but speaker unit might fit inside an O gauge boxcar with a little surgery. (Lining the bottom of the tiny gondola with aluminum foil or metal from a tin can my help with eliminating electrical/magnetic field interference from the track, turnout solenoids, etc., and seems to aid in the Bluetooth reception for the speaker.)
Speaker on a Lionel O27 flatcar.
Speaker Test Video On YouTube
(Video must be accessed through YouTube due to copyright issue with music used.)
It is simply a purchased rechargeable battery powered portable Bluetooth speaker (in a homemade shorty gondola) paired with an Android app:
Custom Soundboard Creator App Link
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