iPhone Passive Amplifier

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iPhone Passive Amplifier

Postby JDaVinci » Tue Aug 28, 2012 5:56 pm

This was a fun little project we did, just because we could. Sometimes making a little something for ourselves gives us a little boost. My wife asked me to make a stand for her phone. I couldn’t just make a stand, it had to do …Something.
Here is what I came up with. This is what we’ve nicknamed: The iGrammaphone.

The design is quite simple, but quite elegant. Essentially, it’s a block of wood, decoratively sculpted around a horn. The horn, is a very inexpensively available bicycle horn. I cut the rubber bulb off the end and plugged it into a hole drilled in the side of my custom made block of wood. Add a little stain and varnish, whalah, a “Passive Amplifier”.

A passive amplifier is an amplification system that redirects soundwaves and makes them penetrate further and more efficiently. So it seemingly makes the sound louder. It actually works about like cupping your hand near a speaker to direct the sound closer to your ear.

This design only works with the iPhone 4 and iPhone 4S models. The previous iPhones, and iPod Touch’s have the speaker on the other side of the charge port so the sound does not get directed properly down the horn.

Feel free to use as you wish, but please let people know where you got it from. Also, please do not reproduce this for commercial use.

The horn can be purchased through Amazon, or many local bike stores.
Amazon :http://www.amazon.com/Bell-Alert-Classic-Bugle-Horn/dp/B000HACTZC/ref=sr_1_1?ie=UTF8&qid=1346173860&sr=8-1&keywords=bike+horn

And the .STL file for machining with a CNC Machine can be found on our blog here:

I highly recommend using Vectric Cut3D or Vectric Aspire to setup your cutting files.
This was meant to be a cheap project, so it was specifically designed around using a 2×4 as the material. But you can use any type of wood you can cut.

Please enjoy!

2012-02-28 22.29.01.jpg
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Re: iPhone Passive Amplifier

Postby snowgrains » Tue Aug 28, 2012 11:49 pm

Very cool! Looks like a fun and unusual project.

Thank you!
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Re: iPhone Passive Amplifier

Postby JDaVinci » Wed Aug 29, 2012 3:48 am

I forgot to post the video of it in action!
Here it is:


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Re: iPhone Passive Amplifier

Postby zeeway » Sat Sep 01, 2012 8:13 pm

Love it. Thomas Edison would be proud of you...

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Re: iPhone Passive Amplifier

Postby Roy Esslinger » Sun Aug 16, 2015 2:33 am

I gotta make one of these. Sure hope mine turns out as pretty as yours did. I will have to try to modify a little I got an I-Phone 6 plus
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