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Yes indeed.

No: there is no body -- well, no metal body; it's inside a bakelite antique wall-mounted telephone mouthpiece. I was under the impression that a 2-wire PiP capsule acts as its own shield so I didn't

Not in normal circumstances. Are you sure that the body in which you put the capsule is properly grounded?

I was somehow stuck on the idea that it's a mono connection. Don't know why ? Glad the shielding works.

Thanks Chris and Jerry: Jerry wrote: It's a two-wire capsule (JLI-61A <https://www.jlielectronics.com/content/JLI-61A.pdf>) -- AFAIK the ground terminal is connected to the capsule body in that

It seems to indicate that the capsule body is not properly grounded. In 3-wire connection, there is no need to shield teh capsule, as long as the body is connected to teh shield. Check your

It is not stereo, it is standard PC microphone wiring of a TRS jack, sleeve is shield + signal and power return, tip is signal, and ring provided power for a capsule with built-in FET. The Amazon page

Progress! Aluminum foil wrapped around the capsule body (but not covering the face of it), which covers the wire connections to the capsule from the wire, makes the hum disappear. I'll solder in some

Get a mono plug. It'safer. How is the capsule shielded? Cover the capsule with an empty can. If the hum is gone - you have improperly or insufficiently shielded capsule.

Meant to also reply to this: If I understand you correctly, I did try this; from previous email: "tried joining signal to ring (in addition to tip) but it didn't seem to make a

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