Sound amplifier for smart phones

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Project by Philippe Zehnder posted 06-03-2014 05:20 PM 5474 views 27 times favorited 12 comments Add to Favorites Watch

This is a very simple tool to amplify the sound of your smart phone. The sound box is made with the wood of used wine crates and functions on the same principle as a guitar. Just see and build it. You will be surprised about the great sound coming out of this little box.

-- Philippe Zehnder,

12 comments so far

View GerardoArg1's profile


1014 posts in 2762 days

#1 posted 06-03-2014 05:53 PM

Cool design and idea. Measures? Thick? Try to copy! Thank for share.

-- Disfruta tu trabajo (enjoy your work) (Bandera, Argentina)

View Diggerjacks's profile


2327 posts in 3907 days

#2 posted 06-03-2014 06:35 PM

Hello PHilippe

I have’t got an I phone but I have several wood boxes for wine …

Thanks for sharing

-- Diggerjack-France ---The only limit is the limit of the mind and the mind has no limit

View mcoyfrog's profile


4757 posts in 4363 days

#3 posted 06-03-2014 06:39 PM

Kwel, I dig it

-- Wood and Glass they kick (well you know) Have a great day - Dug

View waho6o9's profile


8906 posts in 3346 days

#4 posted 06-03-2014 07:01 PM

We shall give it a go, thanks for sharing.

View Dan'um Style's profile

Dan'um Style

14182 posts in 4752 days

#5 posted 06-03-2014 09:11 PM

cool beans

-- keeping myself entertained ... Humor and fun lubricate the brain

View Woodknack's profile


13383 posts in 3149 days

#6 posted 06-03-2014 10:51 PM

Does it work well? I built a similar design but used PVC pipe, it works but doesn’t help much. I get more volume laying my phone over a metal bowl. One day I’ll get around to making a proper horn design

-- Rick M,

View spudhogg's profile


102 posts in 2329 days

#7 posted 06-04-2014 02:12 AM

Please post the dimensions.

-- Spudhogg Woodworks

View Serradura's profile


183 posts in 2712 days

#8 posted 06-04-2014 07:37 AM

Well done and a good none battery operated gadget! (I wonder what would happen if you build one with a resonator….)

-- Não só Serradura, Tomar, Portugal

View enzo61's profile


101 posts in 3980 days

#9 posted 06-04-2014 06:38 PM


I visited your site, congratulations, great idea, new, modern.

Also the idea for the smart phone is great…..........................Enzo

-- by enzo61

View 1Cosmo1's profile


1 post in 2930 days

#10 posted 06-05-2014 01:03 PM

Let’s see, my phone is 2 1/2” x 4 3/4” x 3/8”, but I have a “shock” case on so let’s add a generous 1/4” to those dimensions. I don’t have a wine case but would guess that the boards would not be more than 3/8” thick. I’m also guessing that the phone is sitting on a riser/cradle that places the speaker at the mid-point in height and closer to the back of the “amplifier” than the front.
Soooo. Lets try 8” x 2” for the back and assuming an angle of approximately 25 degrees, we’ll make the front 5” x 2”. The top and bottom look to be 4 1/2” to 5” wide (using the phone and the deck of cards as a reference) which gives us a top and bottom that measures 8” back edge x 5” front edge x 5” wide.
Threw one together with 1/2” plywood scraps in about 30 minutes just using a panel saw and coping saw and 10 1” drywall screws and a gouge to make a cradle in a piece of pine 3 1/2×1” x 3/4” which I attached 1/4” from the back.
It doesn’t wind up looking as wide as Philippe’s but it works pretty good !! If you want to play around with more sophisticated designs, get a book on loudspeaker design.

View Philippe Zehnder's profile

Philippe Zehnder

3 posts in 2371 days

#11 posted 06-05-2014 06:16 PM

Dear all,

Many thanks for your interest. Here are the dimensions of the amplifier:
Height: 2.4”
Wide: 3.2”
Length front: 5.2”
Length back 9.2
The wood is 0.3” thick.
Depending on your smart phone you will need to fix a small piece of wood in the middle of the box in order to keep a certain distance between box and loudspeaker.

-- Philippe Zehnder,

View Buckfever14's profile


23 posts in 3159 days

#12 posted 08-24-2015 02:55 AM

Thanks for sharing! I’ll be making some of these.

-- Mark C.

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