Planar Cell Phone Speakers Project start.. - diyAudio
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Old 22nd June 2015, 03:02 AM   #1
REXRICH is offline REXRICH  United States
diyAudio Member
Join Date: Mar 2014
Location: so cal & nor cal, us.
Default Planar Cell Phone Speakers Project start..

Thanks for reading..

I would appreciate the help of experienced magnetic Planar Driver diy's for this project.

I am invested in the project so Im serious and ready to go. I am at the beginning stages and I would like some people to have an continuing interest in this project. Will post pictures and maybe sound bites as we get though it so you can know how things are going.

I am skilled at building many things. Career wise I'm a 15 year general finish carpenter. Before this I was a 15 year Machinist. My side interests a mix of engineering & art which drives an inventive side. I have a lifetime of experience with many types of materials - techniques and tooling. Built my first custom made speakers at 13yo and been a dedicate audio guy since.
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Hope you don't mind the intro. I just want you to know that I'm not one that will be wasting your help and you to know all interest will all be appreciated.

Yes there is another reason I write the intro. I have already been told right here in these threads that this Won't Work. Im not sure what the means as it could be just in the eyes of the commenter. I think it will or Can work.

This Cell Phone magnetic planar speaker system's overall size will be around the size of the face of a Note 4 or Iphone 6.. 6.0 x 3.0 inches Face and around 1/8th deep. Hopefully I can have magnets on only one side.

The catch:
I want to only use the power provided by the phone Output!

Yeah they told me it won't work. I dont expect High SPL or a beautifully wide frequency response.. Just sound is good enough for now.

Of course I want to do the best design & construction possible to make what I can out of this project. I would do it just to see how it Won't Work.

Please if you would.. Try to see it the way I am and assume it will work well. All we need to do is make it right.
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The Materials for 2 drivers: (I have for now)
*Magnets - 200 of the N52 neo's. Dimensions are 5 x 3 x 2mm.
*Different Foils that could be used for voice traces: (.0006 = 15.24mic) (.0005 = 12.7mic) (.0003 - 7.62mic) All Soft alu.
*Membrane material will be (.0005 = 12.7mic) PVC (Saran Wrap).

Other Materials I will probably be using:
*.010" thick Steel Sheet Metal for the body and magnet struts.
* Small rectangular Aluminum rod bent in 3 places to form a rectangular ring of outer most shape of the phone face that would be the Voice Membrane frame and spacer.
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**Here is where I could really appreciate some of your ideas**

Objectives decisions:
1. Obtain the highest mechanical efficiency as I can.. Best SPL and then Frequency Response.
2. Making the Lightest membrane as to be just strong enough to hold up in the intended environment.
3. Obtaining the highest electrical efficiency at around a Headphone voice coil style Foil Trace Resistance of 40 ohm with the length x width x thickness.
4. Most efficient foil voice Trace design / Layout - Length - Pattern Shape and Gap Widths between traces.
5. Magnet Pattern layout and Spacing.

Build order priorities:
1. Dealing with cutting a voice coil or trace.
*What are ways to efficiently cut such thin foil?
2. Stretching and fastening the PVC Membrane before applying the Alu Trace to it.
3. Sandwiching the Alu Voice Trace between 2 pieces of the PVC Membrane. *Good Idea?
4. Best ways to Stick the Foil Voice Trace to the PVC membrane.
5. Gapping the magnet and membrane.

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(What if)
Lets say the speakers just won't perform well enough. So your help doesn't go to waste.. From what is learned I will then consider adding a very small 5v (USB) powered stereo amplifier.

I will leave it at this for now and see what you guys have to say..
Advice on any step is welcomed. I will not argue any points all views will be considered important. Questionable areas are most important to me and will encourage me to toward the goals of these speakers!

I dont even mind if you guess How you think it will sound if at all!

I will get down to the step by step specifics next.. Hope your there.

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Old 23rd June 2015, 03:05 AM   #2
REXRICH is offline REXRICH  United States
diyAudio Member
Join Date: Mar 2014
Location: so cal & nor cal, us.
Im gathering the materials up. Im going to make a mock test jig out of wood that will position the magnets and membrane in its framework. And use 15 micron household foil to start all testing with. I may post picks of this stage if people would like.

The thing I don't know how to do is calculate the foil Trace length per the proper thicknesses/width mentioned above. I'm less of an electronic engineer than anything else.

Also your thoughts on what makes a more efficient Trace.. A wide foil Trace in front of each of the magnet rows or to divide the width into multiple opposing current paths in front of each magnet row.

Any advice could help..
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