Introduction: Android Passive Amplifier Speaker

Picture of Android Passive Amplifier Speaker

I made this over the course of a couple of days, pretty easy, just be sure to measure twice and cut once!

Step 1: Getting Started

Picture of Getting Started

Cut 4 pieces of select pine (free of knots) to the same dimension. This will vary by phone size and cases etc. I measured with case as I have no plans to disassemble my case with each use.

Step 2: Making Holes

Picture of Making Holes

I used a 3 1/4" hole cutter on 3 of the pieces. After I cut one hole, I clamped to the next piece and drew down the drill press to mark the next piece. I then drilled that piece and did the same procedure with the third one. This help ensure the 3 holes line up when gluing and minimizes sanding of the sides later.

Step 3: Glue the 3 Hole Pieces

Picture of Glue the 3 Hole Pieces

I next glued and clamped the 3 pieces with the holes and let set for the night.

Step 4: Routing the Sound Channel

Picture of Routing the Sound Channel

Turning the 3 piece glued assembly face down I traced my phone to a depth I felt would hold it securely without it being too wobbly when inserted into the final project. I clamped the work piece down to my bench and slowly and carefull routed a depth equal to the thickness of my phone with case. I then, with a pencil, manually drew the channel from where my phones speaker was to the sound holes in the work piece. I then carefully routed that channel out. Before moving to the next step, I used a drum sander on my drill press to sand the cut circles smooth.

Step 5: Sanding and Gluing the Back Piece

Picture of Sanding and Gluing the Back Piece

The next step was to glue the back piece on the work piece. First I sanded the face to make it easier than trying to sand it after the glue up. I clamped and let sit for the night. Be sure to use a wet cloth to wipe out any glue in the speaker that squishes out. Afterwards, I palm sanded all sides smooth. I finished with several coats of spray polyurethane.

Step 6: Finished Speaker

Picture of Finished Speaker

The finished speaker amplifies sound quite well. Its a handsome looking block of wood with great pine graining. Serves the purpose when I use it to just play music for myself without a crowd or party. I have attached a video but it doesn't do justice to the sound amplification.


NoorU6 (author)2017-01-16

I'm making one of these and these instructions were helpful.


Radio Dude (author)NoorU62017-08-15

Looks great, nice job!

Radio Dude (author)NoorU62017-01-16

Your welcome. Good luck!

Merwyn_in made it! (author)2017-08-15

I made mine from plywood, stained with shoe polish , finished with candle wax. I used minimum hand tools. It works perfect :-D

lrwill made it! (author)2016-12-26

fun small project! I made a quick 'rough draft' out of pine, wondering if anyone experimented with the acoustics, hole size, etc.

FileBravo (author)2016-11-06

Nice job and nice idea!
Why not attaching an audio file or YouTube video where you show the effect of the speaker? Is it actually amplifying?

Radio Dude (author)FileBravo2016-11-07

Thank you! Im good with wood but not so much Youtube etc. I do have a video so maybe if I can upload to youtube, ill imbed it to my instructable.

If you can text the video to me I can upload it to youtube for you and you can imbed it :)

Thanks Jonathan. I actually looked for it on my phone but its on my computer at home. I did go to Youtube so I think I should be able to figure it out. If not Ill follow-up with you. BTW, there are example videos from others on youtube so you can hear the actual results of these type of speakers.

Radio Dude (author)Radio Dude2016-11-27 This is the youtube link to a short video of the speaker in action.

FileBravo (author)Radio Dude2016-11-27

Simply great!

offseid (author)FileBravo2016-11-07

Good suggestion! +1

About This Instructable




Bio: Idea Man, Jack of all trades, Master of none. Have gun will travel. Sometimes nothing is a real cool hand. Shoot the three and play ... More »
More by Radio Dude:Beer Bottle Opener W Magnetic Cap Catcher1942 Philco Radio Wine Bar1933 Philco Radio Wine Bar
Add instructable to: