Picture of Passive Speaker for your Smart-Phone
Download and make this Smart-Phone Passive Speaker for free!

There are two designs of base for this model. The base you choose depends on the type of phone you use. If your phone has a loudspeaker along its bottom edge use the iPhone base. If the loudspeaker is anywhere on the back of the phone use the Galaxy base.

Print out the parts of the base that you are using onto thin coloured card. Any coloured photocopier card should be ideal. Choose two complementary colours of card.

This project is the Mk II new and improved version of the Phono-Horn project also available on Instructables here.
It was originally published on www.robives.com 

Step 1: Making The Horn

Picture of Making The Horn
The horn is the same for both base designs. Print out the horn parts page twice on complementary colored card. Score along the dotted and dashed lines then carefully cut out the parts.
Fold over the end tabs to make a triangular section tube on each of the eight horn pieces. This gives strength and rigidity to the open end of the horn.
Tobykempy6 months ago

im confused ive got a nokia lumia with the speaker on the back corner of the phone. where would i put the hole for the speaker

robives (author)  Tobykempy6 months ago
Thanks for your interest. The hole needs to line up with the speaker.
aazzaki8 months ago
what paper type u use ?
joey5611 months ago
Beautiful horn
tfghost11 months ago

I am DEFINITELY going to make one of these. But I just purchased an S5, I will have to figure out the speaker opening for this.

tfghost tfghost11 months ago

S5 active... even greater challenge...

patyolat made it!1 year ago

Greetings from Hungary! ;)

phono horn.jpg
Wow I literally just finished then saw that it wasn't a good idea to do it with printer paper
silvaticus1 year ago
Coolest project ever. Thanks so much for sharining!
Abbey iPhonograph.jpg
robives (author)  silvaticus1 year ago

Nice - only just seen this comment. I love the HMV picture!

cgrrty1 year ago
very nice.
neodymium1 year ago
Can you do this with regular printer paper, or do you need to get something heavier? If so, what weight?
robives (author)  neodymium1 year ago
I don't think it would work with paper. Use thin card 230 gsm / 67lb
Photocopier card is perfect as it will work in most printers.
As far as I can tell, there is only 145gsm 67lb paper. Is that what I should be using?
I don't know how id use this... the speaker on my phone is on the top front.
You would cut a hole in the speaker tube where the speaker on your phone is.
ilovecraft1 year ago
how much is the sound amplification/ increase in loudness? nothing technical.. just approx.
robives (author)  ilovecraft1 year ago
It is not a huge amount but it does make the phone sound much richer with better bass tones and less tinniness. There is a youtube video of the previous version in action here: http://www.youtube.com/watch?v=pVAx1f3y4kE
I tried the original version of this and it did work well to project the sound, but it would keep falling over whenever there wasn't a phone on it. Can this version stand on its own?
I can't directly answer your question so I'm just postulating on an option in either case; If this version does fall over, I think that if you hot glue a couple of thick metal washers or nuts in the bottom back corner (the 90° angle) of both of the triangular base pieces it will add a lot of stability.

In addition to stopping it from tipping forward with the phone removed (if that is still a problem), weights in both of the back corners would probably also help keep it from accidentally getting bumped over - with or without the phone in place.
robives (author)  Xamu1 year ago
Check out step 14
You can see it free-standing without the phone
robives (author)  xenobiologista1 year ago
Yes, this version is specifically designed to stand up on its own.
After gluing up several coats of varathane will stiffen it more, or varathane all the printed sheets then cut glue and give it a coat or two. The extra of the varathane (or shellac, which I believe is a harder finish), may just make the paper more bouncy and have cleaner or louder sound.

Make two put an ear bud in each for more sound from an MP3 player.

this is a very cool instructable
THANK YOU for this biodegradable speaker tutorial!
askjerry1 year ago
Nicely done! I have seen several other variations... but each was designed for a specific phone... typically the iPhone. I like the way you thought about making it fit a wide variety of devices. very nicely done, and a great Instructable too!
cool! not to sound dumb, but can the craft be modified for a tablet?
Just modify the base design or make it larger to support the iPad.
Your not dumb for asking a question, you are dumb when you do not ask questions.
That's not a dumb question. I'd like to build a sound horn for my ipad, too.
robives (author)  Marcos El Malo1 year ago
I'll have a look and see if I can make an iPad version.
padeutsche1 year ago
Did you all know that you can make a passive speakers out of the top of pop bottles, the best one that seems to work best is Coke, and they look like an old style passive speaker, too.
The only passive amplifier I know I like the dimentions as the horn must be logarithmic
wonderful a cheap speaker for the poor people thank you
rimar20001 year ago
Beautiful horn!