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Thanks -- recommended spec for the cap? I took a 16V 47?F, tied the negative lead to the shield and when I touch the positive lead to the plug ring wire the mic goes totally dead, as before. (Or is

So, is a preamp needed in such an application and, if so, what kind of preamp? _________________________________________________________ NO. You should not require a pre amp for the SM58 and your

Could be that the mic power gets shorted out.? You could try a big electrolytic cap instead, shorting the hum to ground but not the DC. Or just connect the mic to both inputs. -Scott

I wrote: Original poster Dan answered: That schematic needs then to be seen as a fake copy imo due to the fact that real manufacturers schematic always afaik or as I have seen in practice has the

An in-line preamp such as the Alctron or FETHEAD is certainly NOT suitable, if only because they need 48V phantom power. Why do you think you need a preamp? Have you tried connecting directly the SM58

I have tried to get rid of this hum many times, both with ultrasonic mic or normal audio. It is the raspberry Pi and the cheap sound card that will make it impossible. There are two solutions. 1.

Thanks Jerry and Scott! -- when I tie the unused wire from the plug to ground as suggested, the mic goes silent - meaning totally dead with no signal at all being recorded. So, currently the live

Unknown. This is one I found from multiple net sources, but the origin was not stated. However, the circuit seemed suspicious, which led to my question. The FET info makes better sense now, yet the

What about grounding the unused channel?

Equivalent to a mono plug would be connecting ring and sleeve together on the stereo plug.? So you could try that.? If it seems to change the signal level from the microphone, change the direct

Hey all -- I have a project I'm working on that involves a raspberry pi, a cheap USB audio interface <https://www.amazon.com/dp/B01N905VOY>, and a small electret capsule (JLI-61A

Take a look at archive.org Am Fr., 21. Feb. 2025 um 03:44 Uhr schrieb Cram via groups.io <mitchell.cram@...>:

You can turn the nag screen off for activations - it's worked for me when using xp on a virtual machine (I too have had to run legacy software in the

Does anyone have a Windows XP install disk they could give or sell me? ?Or a copy with the password decrypted. I need a pukka XP machine to run the software I wrote myself in da last Millenium.

thank you everyone for clearing things up.

Yes - sorry about the typo!? The ones I used are definitely the JLI-140A-T.

Do you mean JLI-140A-T capsules? I have a few of those. They're nice. Thanks for sharing your circuit.

See the attached ZIP (KiCAD 8 project with schematic and board layout, Gerbers, and a PDF of the schematic).? It might be suitable for you to use, either as-is or as a starting point for changes. A

Hi Everything is fine with + capsule on + jack and ground capsule on ground jack. The assembly of the technical sheet is already inside the recorder

No need to duplicate requests. SimpleP48 is adequate for balanced lines of less than 20 meters. Does not require PCB's.