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Tsb 2590 mid side microphone? #P48mems

 

Hi!
I've got 4 tsb2590 laying around, would love to use three of them for a mid side dual output mic.
I'm planning on use the p48 design as Jules has used in the ambi alice. How can I wire the two capsules used for sides?
Should I benefit in a different design with circuitry?
I've seen the mid side dual mic made from Jules, Tabitha, and I'm wondering if I could put the side capsules behind one another instead of side to side; is it a bad idea cause they got out of phase? I'm thinking of half a cm apart at best if put them like that.
I'm very inexperienced in building mics: I did just build the ambi alice in the past.?
 

You can do this, if you bring the capsules out separately and combine in Post you can create the figure 8. Keep them in the same plane facing opposite sides and as close?as possible. It will work.

Jules

On Thu, Feb 6, 2025 at 7:55?AM Muninn via <ninmiso=[email protected]> wrote:
Hi!
I've got 4 tsb2590 laying around, would love to use three of them for a mid side dual output mic.
I'm planning on use the p48 design as Jules has used in the ambi alice. How can I wire the two capsules used for sides?
Should I benefit in a different design with circuitry?
I've seen the mid side dual mic made from Jules, Tabitha, and I'm wondering if I could put the side capsules behind one another instead of side to side; is it a bad idea cause they got out of phase? I'm thinking of half a cm apart at best if put them like that.
I'm very inexperienced in building mics: I did just build the ambi alice in the past.?



--
Best Regards,

Jules Ryckebusch

214 399 0931
 

Thank you Jules!
 

Sorry Jules would it be possible to combine them inside the mic instead? In this way I have to use two mic preamps instead of three ;)
 

Have a look at Zap's S2PCM in his Files
?
You feed each capsule to a separate FET and the Source of each FET to the bases of a Schoeps output stage
?
The circuit needs updating; especially the overly complicated power arrangements.? I'm hoping Zap is still around and will do the honours.
?
I'm actually playing with a LTspice sim of this which is why I want to get in touch with Zephyr (David Searle) who built a version which I tested in Zephyr.doc
?
If Zap is OK, I'll post the recommended changes from my LTspice juju for a specialised Fig 8 with electret capsules for you.
 
Edited

I built an Mid/Side mic using 3 x electret capsules with intergral FETs (in my case they were Primo EM204s) using
It works pretty well, but as you can see, there are quite a? lot of components involved.
It's simpler to create a Mid/Side mic using electret capsules with external FETs. That way allows you to connect the two side capsules in series with? reverse polarity
(As illustrated on Jules? ? schematic )
I did an M/S mic based on that 'series wired' side capsule principle which is simpler (and cheaper!)? than creating an M/S mic using electret capsules with internal FETs.
( Some notes ? )
But as you already have the capsules you want to use, fitted with internal FETs, then I think you'll need to build a version with circuitry based more around the EM204 type schematic.....
 

So here's my very simple M/S design from a couple decades ago:
/g/MicBuilders/files/Scott%20Helmke%27s%20stuff/newbiemic-1.jpg

It's not intuitive what's happening here with the side circuit, and it doesn't run off phantom power. The two side capsules form a "long tailed pair" circuit, which is often used for differential inputs. And I can't vouch for the technical specs, which I never measured. But it does work!

-Scott

On 2/7/25 20:17, Arjay1949 wrote:

[Edited Message Follows]

I built an Mid/Side mic using 3 x electret capsules with intergral FETs (in my case they were Primo EM204s) using THIS SCHEMATIC <>
It works pretty well, but as you can see, there are quite a lot of components involved.
It's simpler to create a Mid/Side mic using electret capsules with external FETs. That way allows you to connect the two side capsules in series with? reverse polarity
(As illustrated on Jules Alice M/S mic <>? schematic )
I did an M/S mic based on that 'series wired' side capsule principle which is simpler (and cheaper!)? than creating an M/S mic using electret capsules with internal FETs.
( Some notes HERE <> )
But as you already have the capsules you want to use, fitted with internal FETs, then I think you'll need to build a version with circuitry based more around the EM204 type schematic.....
--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry
 

Ricardo, I sent emails to your email address. Hope you received the two posts.

Regards,

zephyrmic

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