Mother’s Little Helper

Mother’s Little Helper


John Roland Eberly III

Project Category:
Portable Speakers

Project Level:

Project Time:

8-20 Hours

Project Cost:



Project Description:

Portable Bluetooth vintage train case conversion incorporating finished interior and storage space

Design Goals:
Vintage aesthetic with clean sound and long battery life, more useful than just a “suitcase boombox” by including functional, decorated interior carry space

Driver Selection:

(2) 3″ fullrange Faitalpro, (1) 5-1/4″ Dayton Audio woofer

Enclosure Design:

Re-purposed Samsonite mid-century train case, 13″ x 8″ x 9″. Drivers selected using Parts Express published volume ranges.

Crossover Design:

Active using 2.1 class D amplifier.

Tips & Tricks:

One problem was that the case handle rattled and buzzed, sounding like driver distortion. Adding felt pads between the handle and case solved this.

 Successful project, aesthetics and sound exceed expectations. This case delivers clean sound with not distortion at full volume.

About the Designer:
John Eberly – electrical engineer, woodworker, and jack-of-all trades. Inspired to build these cases by Dr. Records in Fairhope, AL..

Project Parts List:

Part # DescriptionQty.
294-1104FaitalPRO 3FE25 3″ Professional Full-Range Woofer 8 Ohm2
325-201Dayton Audio LBB-3v2 3 x 18650 Lithium Battery Charger Board/Module 12V with Charge Protection1
142-103Lishen 18650 2600mAh Li-Ion Flat Top Battery 3-Pack1
090-50162.1mm Metal Panel Mount DC Barrel Power Jack1
295-307Dayton Audio DC130B-4 5-1/4″ Classic Woofer Speaker1
269-21104″ Wire Mesh Grill with Gold Trim for Up To 3″ Speaker2

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