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Old 14th July 2014, 08:20 PM   #1
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Default Build One Planar Speaker - sourcing parts

Long time reader, but not poster, to the DIYaudio. For the last week I've been reading up on Planar speakers, and I'd like to start by building one speaker. I build guitar tube amps and effects, so I'm experienced with electronics and diy, but just not with Planar. My goal is to build one speaker "just to see" how it performs for electric guitar. It would be nice if the planar were around 12" x 12" with a usable frequency response of 100Hz to 4kHz (or better).

I'm fine with building the thing, I've read all the posts here related to building planars, and, while there isn't a 1, 2, 3 step tutorial anywhere, I believe I understand the principles. What I don't know is the dimensions of the magnets to buy. If someone could tell me, "buy 200 of ____ model", and tell me how to orientate them, then I'd be ready to go.

Thank you for your help.

CHAD
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Old 15th July 2014, 05:44 AM   #2
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Hmmm... Jazzman's DIY Electrostatic Loudspeaker Page and Segmented Electrostatic Speaker good places to start... and this thread... lectrostaComplete newbie.. Cheapish electrostatic speaker build good luck and happy building

Last edited by ebattleon; 15th July 2014 at 05:48 AM.
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Old 15th July 2014, 12:59 PM   #3
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Location: wigston leics england
25 x 6 x 1.5 mm N45 Ni-Cu-Ni magnets from e-Magnets UK - Supplier of Neodymium Rare Earth Magnets Sold 100 a time in plastic container. I used A4 size 12" X 8" with a 8" x 41/2" cutout for the magnets. Placed horizontally. NSNSNS ETC. 4 columns wide and about 140 magnets altogether. Or can make the cutout smaller to fit fewer if required. Your choice! Run the tape between the magnets backwards and forwards until the end. Check for forward movement of the diaphragm with battery, so if you make another one you can get them in phase. Have fun, ask if not sure.
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Old 15th July 2014, 07:22 PM   #4
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Location: Jackson,michigan
When buying magnets try to get the most material you can for your money as Cost per Cubic Inch (ci) or Cubic Centimeter (cc) for whatever grade you decide to use.

If you want use Neo's and find a really good price, remember that the smaller sized magnets are harder to work with, especially when you are trying to fasten them down end to end with the same poles pushed together.

When you stack magnets for more strength it is the same as wiring Batteries (voltage sources) in series.
And every time you double the stack (thickness) you double the magnetic flux strength ( or lines of forces).

This is why I say to get the most volume of material for your dollar, providing it is of a workable size for your particular project.

I only know of 2 or 3 really good suppliers here in the states when it comes to prices, and a Google search will bring them up for you.
I have posted such links in another thread but I don't have them handy at this time.

FWIW

jer

Last edited by geraldfryjr; 15th July 2014 at 07:28 PM.
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Old 16th July 2014, 12:41 AM   #5
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Quote:
Originally Posted by ebattleon View Post
Place foot in mouth close firmly...sorry esl on the brain...
now for a useful link...
Planar Loudspeakers Ribbon Foil Speakers Project, magnetostatic design
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Old 16th July 2014, 03:06 PM   #6
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Quote:
Originally Posted by JAMESBOS View Post
25 x 6 x 1.5 mm N45 Ni-Cu-Ni magnets from e-Magnets UK - Supplier of Neodymium Rare Earth Magnets Sold 100 a time in plastic container. I used A4 size 12" X 8" with a 8" x 41/2" cutout for the magnets. Placed horizontally. NSNSNS ETC. 4 columns wide and about 140 magnets altogether. Or can make the cutout smaller to fit fewer if required. Your choice! Run the tape between the magnets backwards and forwards until the end. Check for forward movement of the diaphragm with battery, so if you make another one you can get them in phase. Have fun, ask if not sure.
See, this is where I run into problems. I've read many of your posts with magnet suggestions and have yet to find the exact magnet referenced. Can you post the specific part number or link to the exact page on emagnets? There are so many options.

I feel like my wife sending me to the store to by a box of cereal. It sounds easy until you walk down the isle. Healthy? Tasty? Chocolate? Rice? Wheat? Frosted? Hot or cold?

CHAD
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Old 16th July 2014, 03:17 PM   #7
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How about these 30mm x 10mm x 2mm N50 Neo magnets?

20pcs N50 Strong Block Cuboid Neodymium Magnets 30mm x 10mm x 2mm RARE Earth Neo | eBay

CHAD
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Old 16th July 2014, 05:37 PM   #8
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You would need about 7 or 8 of those packages to have enough for a 12"x 12" size panel.

This is assuming 15 rows spaced 10mm apart and 30mm long.

This should give you enough room to possibly use up to 4 traces of voice coil in between each row of magnets.

This should give a decent efficiency and a usable resistance range for your amplifier.

jer
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Old 16th July 2014, 06:10 PM   #9
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Quote:
Originally Posted by geraldfryjr View Post
This should give you enough room to possibly use up to 4 traces of voice coil in between each row of magnets.
I don't understand the "up to four traces" comment. I thought there was one zig-zag trace. Do you mean layers?

CHAD
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Old 16th July 2014, 11:24 PM   #10
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They could be layers if each layer is insulated from the other or they could be side by side, just in the Magnetostatic design.
As it is an Apogee clone it has two traces per section.

Just make sure that all of the separate circuits (traces or Voice Coils) are in series and not in parallel or else it will be no different then having just one trace.

jer

Last edited by geraldfryjr; 16th July 2014 at 11:29 PM.
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