Smartphone Acoustic Amp

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Project by Timzwoodz posted 04-19-2016 10:58 PM 1861 views 11 times favorited 5 comments Add to Favorites Watch

New products for my next craft show; thanks to and inspired by LJ “nblazek” for his design and video submissions

Dimensions: Three boards, 3/4” thick x 5” wide x 11.5” long

Top board slot: 3/4” wide by 3”long, centered 1.5” from the back, done on the router table

Middle board: Made a template (4th picture) using a coffee lid to determine the curvature from the back of the slot to the front edge, with the curve terminating about an 1” from each side at the front. Cut the shape to rough dimension with a bandsaw, then used a straight router bit with top bearing guide to smooth the edges, using the template as the guide. The template is temporarily screwed into the middle board on the non-waste portion, so those holes won’t be visible when assembled.

Bottom board: Used the template to locate / glue in a 1/4” thick by 1” wide x 2” long resting pad centered along the back of the slot, for the smartphone to rest on. This allows phones with either one of two bottom speakers to be used regardless of speaker location.

Stained all visible interior portions of all boards prior to glue-up assembly (lesson learned).

After assembly, beveled the sides and back on the table saw with an 11 degree cut, leaving the front flat.

Woods used: cherry, white oak, and maple, with walnut or bloodwood laminated stripes on the top board (just for a little flair)

Finished with Watco Natural Danish Oil

-- Being half Irish and half Scottish, I love to drink but hate to pay for it

5 comments so far

View westok's profile


19 posts in 2421 days

#1 posted 04-20-2016 10:10 AM

Nice clean design. May have to give this a try. Thanks!

-- Mark K, Birmingham, AL, "The rusted bolt will not move until you utter the "magic word", unfotunately, children are usually present."

View slapdash's profile


108 posts in 2760 days

#2 posted 04-20-2016 07:34 PM

Cool. What is the sound like?

-- I'm not creative, I'm just bad at copying

View Gary's profile (online now)


1424 posts in 4860 days

#3 posted 04-21-2016 01:31 AM

I’ve made a number of these; posted one.
Learned something interesting:
If you put two face to face, it’s louder than the one by itself.

-- Gary, Florida

View Timzwoodz's profile


19 posts in 2065 days

#4 posted 04-21-2016 05:35 PM

For Slapdash: The sound is increased because of direction and “channeling, just like a megaphone…but no bass/treble adjustments. I’ve read other LJs consider using softer woods (cedar, pine, alder) to perhaps affect the sound, so if these sell, I may try the softer woods

-- Being half Irish and half Scottish, I love to drink but hate to pay for it

View slapdash's profile


108 posts in 2760 days

#5 posted 04-21-2016 08:04 PM

I wonder if they were hollow with a sound whole, whether they would resonate like an instrument? Too much work to be economic, but I’m off to try making one out of cardboard

-- I'm not creative, I'm just bad at copying

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