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Interesting project. I made a basic omni circular capsule many years ago (I had access to a friends lathe and pretty well equipped workshop at the time).? Diaphragm material was an issue (especially

What impedance converter (head amp) are you using? What polarization voltage (bias) are you using? What preamp?

Really amazing! Brilliant! All encouragement Best wishes David P

Awesome! And yes…. You are “supposed to do that” lol! Best Regards, Jules Ryckebusch

I've been doing the thing that you're not supposed to do: building my own condenser capsules. I thought I'd share my technique. I wanted to experiment with the shape of the capsule, membrane tension,

This is only a quick 'concept' schematic.... As we have discussed in this thread already, the decision to use a single sided audio output does not affect the option of creating a balanced output. The

But this is not balanced or am I missing something? Can we go further with this one?

I think you could try something like this..... You could use a dual OPA1642 and a single OPA1641. By not regulating the op-amp supply, - and carefully selecting the feed resistors for the regulated

How would it be with 3 opamps? regarding not concentrating on the existing PCB

Probably not. In fact it would probably be better to simply regulate the Voltage Multiplier? DC supply, and not the op-amp supply That might help minimise current drain -? which is going to be

Is C8 and C9 still necessary?? C13,C14?

*Here's a (very) rough schematic* ( http://www.jp137.com/lis/OPA.Alice.mod.ideas.jpg ) of what would be involved, using the existing dual PCB. Notice the output is now single single sided (but still

Quiescent current of each section is rated at 2.3mA maximum, for a total of 9.2mA, which is still within specs. Does not leave much for operating currents, but it shouldn't be an issue. Typically,

You might just keep it in spec (max 10mA) if you don't regulate the op-amp supply, and? just regulate the voltage mulitplier (VM) supply. I found that using 27k feed resistors to the VM circuitry

I meant this simple P48 https://audioimprov.com/AudioImprov/Mics/Entries/2021/1/18_The_Simplest_True_Condenser_Circuit.html

Remember, you have another op-amp / mixer available at the mic input, so you could feed the front buffer straight to pin 2 of the XLR. Make the 4th op-amp a non-inverting buffer if you want to get rid

Each channel draws the same quiescent current. So one of these is like 2 opa1642 Which Is too much for Phantom Power. Best Regards, Jules Ryckebusch

OPA1644 is the quad version of the 1641 (single) and 1642 (dual) The advantage of having only two power pins for 4 opamps is often negated by the more difficult layout.

With an OPA 1644?

What are you using for Capules? SimpleP48 is for Electret ones that have a built in FET. Best Regards, Jules Ryckebusch