Le 24/02/2025 à 23:09, Casey via
groups.io a écrit?:
Thanks Chris and Jerry:
Jerry wrote:
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
connections.
It's a two-wire capsule () -- AFAIK the ground terminal
is connected to the capsule body in that capsule. I have
continuity between capsule body and plug sleeve. It just seems
like the connection between the cable and the capsule (maybe 5 or
6mm) where the wires are exposed is enough to admit hum?
Not in normal circumstances. Are you sure that the body in which you
put the capsule is properly grounded?
Chris wrote:
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.
If I use my separate stereo PiP mic, which is wired one capsule
to tip and one to ring, both mics work in this interface
(meaning, their input shows up in the mono output)... does that
contradict anything that you said above? E.g. it seems that ring
isn't just for power but is actually receiving a separate signal
(which is mixed to mono before going to the computer).
Also, currently the mic is just wired signal-to-tip,
shield-to-sleeve, so ring isn't connected to anything, and it
works (with hum), implying that the bias isn't only on ring?
However, most of the information I could find about PC
standard microphone connections indicated that both the
resistor and the DC-blocking capacitor are typically in the
audio interface, in which case I don't see why connecting tip
and ring together at any point would not work.
I may have been unclear: connecting tip and ring does work, it
just didn't eliminate any hum so it didn't solve the issue.
I am not familiar with"PiP," does it match that connection
described above?
I admit being mystified at the myriad ways there seem to be for
1/8" jacks to be wired, so I don't know if it matches or not,
but PiP is just "plug in power" referring to lower voltage
supplies on (usually 1/8") mic inputs.
I see that there is another response which came in while I
was typing which indicates that you did add better shielding
using conductive tape.
Yeah that seems to solve it completely.
-c
