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Have a look at Zap's S2PCM in his Files ( /g/MicBuilders/files/Zapnspark/FloobyDust ) You feed each capsule to a separate FET and the Source of each FET to the bases of a Schoeps

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 ;)

I would say slightly larger. With Zin= 1.5k and Zo=150r, the capacitor must be 1.35uF for -3dB@70Hz

That depends on your capsules impedance and the impedance of the following circuit. Trial and error is a fast way to discover what works for you. 2,2uF? Lower higher? It costs near to nothing to try

The actual effective resistance for LF roll-off is 1k5 (input Z of the preamp) + Zo (of the mike)? So a much smaller capacitor is needed for a 70Hz cut-off. But Zo of the mike(s) varies a lot so,

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You're having convergence issues. Here's a PSPICE document that covers possible

Thank you Jules!

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

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

Hi! I did built Jules ambialice and planned to build two but didn't sadly. Ive got four tsb2590 that I'm not using would you like to buy them or trade them with me? I'm located in Italy. I would love

Usually multiple package opamps are treated as individuals, each section being the typical +in, -in, out, V+ and V-. It does not represent the actual topology, but for simulation purposes, it does the

It sepends on the actual input impedance of the mic preamp. For a typical 2kohm input impedance, the capacitor should be 1.15uF for 70Hz cut-off. The actual response would be first-order, i.e. only

I literally took the .lib file provided by TI, which defines the SUBCKT and appended my SBCKT to it. Yes. My intention was to account for all the pins with the parameters already defined in the .lib

Got it, thank you much. Then, what should be the capacitor value to cut off audio at frequencies lower than 70Hz? Thanks again.

Hold on, did you also define the SUBCKT for OPA164x??? I presume you did since this is what TI provides. But I want to make sure. Basically, what you've done is to "call" two versions of the

I'm having fun with variations on the OPA Alice circuit and would like to be able to model using SPICE in KiCAD. I found the model on TI's website but it doesn't have the correct subcircuit for a

In order to work, it takes disconnecting one of the internal 6.81k resistors inside the preamp, or to isolate it DC-wise, which is exactly what teh capacitor does.

A couple of years ago, Martin Kantola shared his simple P48 without a capacitor. Pure genius! Do a search for: One resistor P48 electret mic Different pros and cons compared to SimpleP48.

Tj=he role of the capacitor is to conduct AC signal whilst isolating DC. Not used, as in "not there" or as in "replaced with a short"? In the former case, very low signal, in the latter case, too low