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Please look at this. https://www.jlielectronics.com/content/TroubleshootingOPA-Alice%20MicRev1.pdf You have something touching possibly. I write this based on my own feedback (I have misconnected

As I said I would get back with updates. I insulated both pcbs (bias- high impedance) using tape around them and I cover all the inside of the mic body with copper tape. Good signal and healthy

It should be OK as long as the unconnected wire is properly dressed as not to pick up interference. Well, it does matter, since the stray capacitance of the backplate is higher than that of the

Thanks Jerry. To start with while I was reducing cabling length I shorted either the bias IC or a cap - diode around it. When I sort that out I will try all the meters you suggested. Just a couple of

As I suspected from the start, I believe your capsules are good and the problems you had are elsewhere. >

No. It can be separate. Copper foil is OK. >

Without being sure I just used the continuity mode on my DMM. No continuity between capsules and between capsules and backplate (common backplate cable).

Thanks Jerry. Is it necessary the bias PCBs being in the same enclosure with the high impedance circuits? True. Sorry for that. I read it later. The capsule is in a mesh - the normal faraday BM 800

Head is the circuitry that receives the capsule and transforms the very high impedance into a more manageable impedance. As I wrote earlier, using shielded wire is not adequate. You have to make sure

Head is the circuitry that receives the capsule and transforms the very high impedance into a more manageable impedance. As I wrote earlier, using shielded wire is not adequate. You have to make

You can start with checking with the mulimeter that the capsules are not shorted. >

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