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Old 4th September 2011, 09:54 AM   #11
ptchev is offline ptchev  New Zealand
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Good luck with the speaker project. I was looking forward to hearing how the mic project panned out.
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Old 4th September 2011, 11:45 AM   #12
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Why not do a Soundfield mic?
Soundfield microphone - Wikipedia, the free encyclopedia
So you make the project more about this unusual mic technology.
They are eazy to make from of the shelf capsules and the results can be jaw dropping.
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Old 5th September 2011, 11:06 PM   #13
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Dirk95100 View Post
Why not do a Soundfield mic?
Soundfield microphone - Wikipedia, the free encyclopedia
So you make the project more about this unusual mic technology.
They are eazy to make from of the shelf capsules and the results can be jaw dropping.
Hi,

That really ends up as an advanced electronics mixer project, I get the
feeling the OP wants a more hands on practical project, not electronics.

rgds, sreten.
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Old 5th September 2011, 11:31 PM   #14
dewardh is offline dewardh  United States
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Quote:
Originally Posted by Rullknufs View Post
This seems like it will be maybe too difficult after all.
It is not all that difficult, but it is enough of a challenge that there's a *lot* to learn by doing it. Probably take more than 100 hours, but more than worth it in the rewards (which include an excellent microphone) and a number of newly learned skills.

Austin Microphones
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Old 6th September 2011, 03:12 AM   #15
dewardh is offline dewardh  United States
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Oh, and worth noting . . . the best microphone transformers in the world come from your neighborhood (sort of) . . . I've used several of their LL2911 in ribbon mic mods. It might be worth it to see if they would donate a sample for "educational purposes" . . .

Lundahl Transformers, audio transformer and tube amplifier transformer manufacturer
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Old 6th September 2011, 06:49 PM   #16
sreten is offline sreten  United Kingdom
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Hi, However stuff is laudible, what is needed is a school level project, rgds, sreten.

KISS is a concept that needs to learned early, there always will be complications.

Given the constraints a resulting "excellent" microphone is highly unlikely.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 6th September 2011 at 06:58 PM.
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Old 7th September 2011, 02:34 AM   #17
dewardh is offline dewardh  United States
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Quote:
Originally Posted by sreten View Post
what is needed is a school level project,
I was building cloud chambers, spectroscopes, vacuum systems and amateur radio transmitters at that age (maybe because nobody told me I couldn't). The microphone project would have been a challenge, but hardly beyond me. Guess we have a different perspective on what "kids" can do . . .
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Old 7th September 2011, 02:39 AM   #18
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Rullknufs View Post
Remember this is mainly thought to be a school project, so try to keep it somewhat cheap. All the parts must be available in europe (preferably in Sweden).
your close neighbor might help you

ThatMic

Dantimax (elektronik) - Preamps_-_poweramps
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Old 7th September 2011, 02:08 PM   #19
tinitus is offline tinitus  Europe
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DIY Microphone Projects

strangely, searching on bass buffer seem to give better search results, or at least to me it does
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Old 10th September 2011, 12:07 PM   #20
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You can maybe make some already well known types of microphones like condenser or ribbon types. They offer highest sound quality that you can use even for speaker measurements, but constructions are simple (see wiki) except of few problems.

Condenser microphone require phantom power (48V DC voltage) to polarize membrane, and I think because of high impedance, also FET preamp. There is a problem to find thin, elastic, but plane material for membrane.

Ribbon microphone have practically same construction like ribbon tweeter. It is very simple construction, but you need small transformer to transform signal from very low impedance of ribbon, to much higher of mic preamp.
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