Passive Speaker for your Smart-Phone
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
Passive Speaker for your Smart-Phone
passivehorn.pdf1 MB

Step 1: Making The Horn

Passive Speaker for your Smart-Phone
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.

Step 2:

Passive Speaker for your Smart-Phone
Pair up the horn pieces and glue together the first tab as shown. Match pieces together so that you have two pairs with extra tabs and two pairs without.

Step 3:

Passive Speaker for your Smart-Phone
Glue the pieces together by the first tab in this alternating pattern.

Step 4:

Passive Speaker for your Smart-Phone
Roll round and glue down the remaining first tab to make a tube.

Step 5:

Passive Speaker for your Smart-Phone
Work your way round the second row of tabs gluing them down as accurately as possible.

Step 6:

Passive Speaker for your Smart-Phone
Work your way to the end of the horn gluing one row of tabs at a time taking care to keep everything lined up accurately.

Step 7:

Passive Speaker for your Smart-Phone
Glue the horn end into place. Set the horn to one side and start work on the base.

Step 8: Galaxy Base

Passive Speaker for your Smart-Phone
This base, has specific markings for the Galaxy S2, S3 and S4 but is easily adaptable for all phones where the speaker is on the back face of the phone.
Glue together the two sides as shown.

Step 9:

Passive Speaker for your Smart-Phone
Assemble the square section cross piece.

Step 10:

Passive Speaker for your Smart-Phone
Assemble the two back supports and the phone stand.

Step 11:

Passive Speaker for your Smart-Phone
Passive Speaker for your Smart-Phone
Glue together the long horn tube as shown.
Fold the two end sections in and glue them down being sure to keep everything lined up and not twisted.

Step 12:

Passive Speaker for your Smart-Phone
Glue the two back pieces to the grey glue areas on the stand sides. Press the horizontal square tube into the slots on the side pieces. There is no need to glue it, friction will hold it into place and being able to lift it in and out is handy when you are cutting holes in the tube.

The base is designed to be usable with a wide range of phones. If your phone has a speaker towards the bottom edge of the phone back like the Galaxy S2 and S4 then cut out the hole in the top centre of the horizontal square tube. Line up the long horn tube with that hole and glue it down (Left picture). You can then cut a hole in the horizontal tube which matches the position of the speaker phone.

If your phone has a speaker anywhere else on the phone back then there is no need to cut into the horizontal tube at all.

Position the long horn tube side to side on the stand so that it crosses the position of the phone's loudspeaker and glue it into position (right-hand picture.) Cut a hole in the long horn tube so that is lines up with the phone's speaker.

Step 13:

Passive Speaker for your Smart-Phone
Glue the phone stand piece into place.

Step 14:

Passive Speaker for your Smart-Phone
Passive Speaker for your Smart-Phone
Fit the horn to the stand. It is a taper fit so there is no need to glue it. Being able to take it apart is handy for storage. This model is set up a Samsung Galaxy S4.

Step 15: Making the base for iPhone

Passive Speaker for your Smart-Phone
Passive Speaker for your Smart-Phone
Not just for iPhones, this base will work for all phones where the loudspeaker is along the bottom edge of the phone.
Fold up and glue the long horn tube as shown.
Fold the two end sections into place and glue them down.

Step 16:

Passive Speaker for your Smart-Phone
Passive Speaker for your Smart-Phone
Passive Speaker for your Smart-Phone
Assemble the phone stand piece as shown in the first picture
Glue the tab of the long horn tube to the cross piece...
...then fold it over and glue it down as shown.

Step 17:

Passive Speaker for your Smart-Phone
Assemble the two sides.

Assemble the two triangular section cross pieces.

Glue the cross pieces to the grey areas on the back of the side pieces.

Step 18:

Passive Speaker for your Smart-Phone
Glue the long horn piece into place gluing it to the two side pieces and the top cross piece.
Position your phone on the stand and mark where the speaker meets the stand. Carefully cut out a hole in the triangular stand piece with a sharp knife.

Step 19:

Passive Speaker for your Smart-Phone
Fit the horn to the stand. It is a taper fit so there is no need to glue it. Being able to take it apart is handy for storage. Position your phone on the Passive Speaker and crank up the volume!
 
 

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