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1st order ambisonic mic utilizing both front and back LDC diaphragms

 

Hello everyone,
I have been bouncing an idea around in my head and wanted to throw it out to the collective wisdom of the group and see where it goes.
I built Jules' ambisonic mic from his and it is a great mic. But I would like to design one that uses large diaphragm, externally polarized condenser capsules, and takes advantage of both front and back diaphragms.
I'm thinking of a combination of the "multitrack microphone" idea, like , but with enough capsules for 3D first order ambisonic.
I spoke a bit with Arienne about using her ?
Initially I was just thinking of 4 cardiod capsules in the tetrahedral array, but she suggested with dual diaphragm capsules, I wouldn't need four of them.
I have read through the Springer ambisonic document but can't figure out how to arrange dual diaphragm capsules to get the correct alignment for ambisonic pick up. Any ideas?
 

You can sort of make an ambisonic mic using dual diaphragm capsules in native B-Format arrangement of three orthogonal fig 8 capsules and one omni. The trouble is the capsules need to be perfectly coincident, which is impossible with four capsules. Horizontal B-Format is easier, with a blumlein pair of fig 8s and an omni but still not perfect.
For A- Format, single diaphragm cardioids would be fine. A bit like the Nevaton VR mic, but I think that uses edge terminated CK12 type capsules.

J
 

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You can do this with three dual diaphragm LDC¡¯s at this point you don¡¯t need a tetra array you do X, Y, and Z axis. Google ¡°native B format ambisonic array¡± ? You still have the fact that things aren¡¯t fully coincident. This project is actually on my ¡°to do list¡± although I have a few other things ahead of it.?
Best Regards,

Jules Ryckebusch?

On Jan 15, 2024, at 07:45, Mark Day <neowalla@...> wrote:

?Hello everyone,
I have been bouncing an idea around in my head and wanted to throw it out to the collective wisdom of the group and see where it goes.
I built Jules' ambisonic mic from his and it is a great mic. But I would like to design one that uses large diaphragm, externally polarized condenser capsules, and takes advantage of both front and back diaphragms.
I'm thinking of a combination of the "multitrack microphone" idea, like , but with enough capsules for 3D first order ambisonic.
I spoke a bit with Arienne about using her ?
Initially I was just thinking of 4 cardiod capsules in the tetrahedral array, but she suggested with dual diaphragm capsules, I wouldn't need four of them.
I have read through the Springer ambisonic document but can't figure out how to arrange dual diaphragm capsules to get the correct alignment for ambisonic pick up. Any ideas?

 

On Mon, Jan 15, 2024 at 09:02 AM, jack wrote:
Nevaton VR mic
Wow, I have not seen this mic before. This is exactly what I want to build, and after seeing the price of the Nevaton, building my own makes sense. Just have to figure out if I can get it all to fit into one of the U47 bodies on Aliexpress.
 

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My challenge is the body to hold them as well. I¡¯m going to design a custom PCB for multi channel OPA circuits ??
Best Regards,

Jules Ryckebusch?

On Jan 15, 2024, at 08:36, Mark Day <neowalla@...> wrote:

?On Mon, Jan 15, 2024 at 09:02 AM, jack wrote:
Nevaton VR mic
Wow, I have not seen this mic before. This is exactly what I want to build, and after seeing the price of the Nevaton, building my own makes sense. Just have to figure out if I can get it all to fit into one of the U47 bodies on Aliexpress.

 

That is awesome! I look forward to seeing the new Instructable. I have a contact at Ningbo Electroacoustics in China and bought one of their last year. It is a clone of the old AKG C426B. That body might work, or something similar. Or as I mentioned earlier some of the many U47 bodies might be large enough. The challenge is not so much the body itself, but the PCB rails inside!
 

Of course to go with the tetrahedral cardiod array, you could use the TSC-1 LDC from JLI since they are single diaphragm.

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