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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

Jerry, I have measured 32mV. Jules, It does work, but 90% of signal is white noise alone. There are no 50Hz components visible to me in EQ, so that tells me everything should be grounded

Sure post more details! I think a new PCB wouldn't be a problem, just need the correct schematic.

That would do it. Got a lead on one that is 20-20K and inexpensive? I just used my last batch of good ones on a 12 channel mic splitter. They were pico brand and $67 each. Best Regards, Jules

Why don't you stick a transformer in there and be done with it?

I'll look at it further. This was my first attempt. :-) -- Best Regards, Jules Ryckebusch 214 399 0931 Linkedin <https://www.linkedin.com/in/jules-ryckebusch/>

That's pretty damn clever! I'm quite fond of my fully balanced outputs though, but I know we're pretty much limited to two x OPA1642s (providing 4 op-amps) with phantom power. Is there a way of

You guys all have me thinking here. As I was falling asleep last night I thought of this. See attached. In essence we take the both diaphragms and go to a High Z buffer. Then the rear goes to a unity

Wiktor, let me ask again here, does it work when used in a microphone? I am suspecting it will. Jules wrote:

If you connect a 1G resistor in series with the multimeter, it forms a voltage divider by 1/1000, so every mV you me??? asure is an acual volt at the circuit's output. You should measure 80mV.

Yea Jerry, you are correct here! the 1gig isn't a path for current flow. OOpppsss... Jules wrote:

I've connected 1 gigaohm resistor in series with multimeter, and then measured milivolts. Everything is still invalid, voltages are same as without 1gohm resistor. niedz., 10 kwi 2022 o 06:25 Jerry

Further to that comment, I took a look at Jules' dual OPA schematic here; https://content.instructables.com/ORIG/FTV/ESBC/KKV5OYHS/FTVESBCKKV5OYHS.pdf I think it should be possible to achieve what

Actually, once the capacitor is charged, there is no more current drawn, except the fraction of femtoAmpere due to residual resistance of the insulating materials, which is way higher than

I asked a similar question a while back and got some great resources. Here's the link to that discussion. /g/MicBuilders/message/32497 I did end up getting a few takstar capsules, a