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Could you please be more specific,? Scott? How can I do that with a simple multimeter and a small variable DC supply up to 50V? Thanks.

Thanks Jerrt Lee Marcel. That's a really good advice. By head I guess you mean the pcb outs (signal and voltage polarity). Am I correct? Is there shielded wire of such small gauge (or could I create

Hi Homero, The signal level into the FET is one of the things that will need to be tuned, depending on the capsule output, the use of the mic, what acoustic levels it operates at, and how much

Thank you for getting back to us, this looks great!? I was reminded of something while reading your write up.? I've attached a page from Henry at Audio Improv as additional research material for

*What is the signal level (either input or output)? * @William Spragens <henryspragens@...>, just checked and the Input level is approx 400mVpp. Testing cap is 56p and charge amp cap is 82p, so

Wires between capsule and head must be kept as short as possible and must be shielded for proper operation. However shielded cable is improper since it adds parasitic capacitance that reduces

As a simple first test, measure its capacitance? -Scott

Hi. My question is this simple one. Is there any easy test to make sure that a dual side true condencer capsule is not burnt or shorted or faulty without using it on a mic. No data available. Cheaper-

Triton Audio (Fethead etc) and also based in the Netherlands have been marketing a True Phantom phantom power supply for some time: https://www.tritonaudio.com/true-phantom

Jerry Lee Marcel, Agreed. But the price versus gain in performance makes this a curiosity. So slight as being of very little interest. Read

I agree with all that's been written before. It's a very interesting intellectual challenge though. Brilliant piece of design. The claimed benefits are at least of second order. The test circuit they

In the light of chip shortages I would be really hesitant to add to the BOM of a product for marginal benefits. They are optimizing something that is really in the weeds here. Best Regards, Jules

I've seen this discussed elsewhere a few times and everyone seems to agree with you. In the current economic climate I don't see this product taking off, but who knows? You just need a few big names

Correction, I looked at the data sheet, it still uses the 6.81K resistors but looks to maintain a constant supply to them. Again, I still don't see a need. Jules [email protected]> wrote: --

I am at AES in Europe (which is really fun) and a vendor approached me with a concept of their custom chip that supplies a constant current instead of using 48V and 6.81K resistors. It is here

What is the signal level (either input or output)? Distortion in a common-source JFET or triode is normally very sensitive to level. The 2nd harmonic at 46dB roughly (0.5%) below the 1KHz signal and

Hi! Just uploaded two THD Graphs, one for a Pat's Mic build and the other one for an OPA Alice build. I tried to use the same Input levels on both tests. Here are the graphs: Pat's Mic Build :

*1. Is the charge amp being accomplished through the Op Amps? * Yes, the first OPA (1C1A) is in a charge amp configuration. *2. Is it possible to use a Jfet with a built in diode for the

It is quite possible, but, as I wrote earlier, it wouldn't result in the "tube sound" the dicrete JFET is supposed to bring.

Homero - Thank you for the updates!??1. Is the charge amp being accomplished through the Op Amps??? 2. Is it possible to use a Jfet with a built in diode for the triode section?? Maybe something