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Old 29th October 2012, 09:13 AM   #171
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Am rebuilding a double diaphragm design at the moment, it wasn't very sensitive, and I did use 100 um polyester. I'm glad I use 12 um now, makes a big difference.Laying in bed this morning thinking about the design of my new project, building a very baby grand piano shape speaker using small neos. Especially for playing solo piano music. Will only need one as the piano is not in stereo. The sun is shining, so I had better get outside and cut some more MDF. BEFORE IT RAINS.
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Old 3rd November 2012, 11:48 AM   #172
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Default REPAIR TO BROKEN 3 MM TAPE ON DIAPHRAGM

First picture shows where I broke the tape, and I have put tape for penny washer. 2nd pic shows penny washer in position with wood surround for holding diaphragm in tight and correct position. 3rd pic shows diaphragm fixed. 4th pic shows other penny washer for connection of the back resistor. You can see the other penny washer for other back connection top right.5th pic shows it standing up on feet, although not quite finished. Final imp is 4.2 and 6.4 ohms for my ONKYO Amp. 6th pic another view on the dining table. Rebuilt these speakers from poor push pull design using 4.5 mm wide tape and 100 um polyester diaphragm material. A big improvement all round.
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Old 4th November 2012, 01:29 AM   #173
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You don't happen to be related to Amar Bose?
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Old 4th November 2012, 08:54 AM   #174
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Quote:
Originally Posted by Andersonix View Post
You don't happen to be related to Amar Bose?
No, why did you think so? Who is Amar Bose? I built that speaker 20 years ago!
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Old 4th November 2012, 10:55 PM   #175
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He's got a lot more money than I have about a billion. He also designs more speakers than I have,although I prefer my designs to his.
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Old 7th November 2012, 08:59 PM   #176
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Henry - Bose only have 2 successful products & 1 of those is out of production!!! - from what i see here you have at least 15!!!

Wow what a great site!

Hi Everyone... & greetings from a damp north somerset

Been reading through the posts over the last few days - and have been considering building some planers for quite a few years now -

have a few questions / ideas:-

Magnets - the self adhesive type (plastiform) seem to have n&s poles running along the length - would there be an advantage to running a conductor between these as well as the gaps between the magnets?


And - could the field strength be increased by doubling up ? (one strip on top of another)

Foil - Aluminium or copper ? (for the above i guess you would need <2mm) copper, i guess would be easier to work with but is the extra mass a problem?

Diaphragm - Mylar seems to be the obvious choice - how tight ? i have an idea for a sandwich design that would tension the Mylar as the 2 half's of the frame was bolted together - you can then shrink another 2% with heat (same as the esl boys do)
- the Mylar would be tensioned before the "voice coil" is attached.

I had thought of using aluminised Mylar & etching the conductors on this - anyone tried this? (either diy or commercially ) - I've dismissed it on the fact that the aluminium is only a few atoms thick and would probably O/C as soon as you passed any real current through it

Sorry to wade in with so much on my first post - but this site has really got me wanting to get started !!

Steve

Last edited by steve1564; 7th November 2012 at 09:27 PM.
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Old 8th November 2012, 09:23 AM   #177
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New way to stretch diaphragm!....

Click the image to open in full size.


Sorry couldn't resist it!!...
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Old 8th November 2012, 07:47 PM   #178
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Steve: You are mixing up planar magnetics with electrostatics. If you want to go straight to the front of the queue, then skip past anything that invokes the black magic contained within magnets.
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