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| Author |
Message |
rtgreen
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Condenser Mic interface?
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Mar 1 22:05 UTC 1998 |
I have a Realistic 33-1090b condenser microphone, in a PZM style pickup.
The microphone came with a small battery power supply / pre-amp and an
unbalanced output connector. I have an application where it must feed
the recorder through a 50foot cable. Needless to say, hum is a frequent
problem.
The mixer has available some balanced inputs with phantom power. Can
anyone suggest a source for a circuit which will use the phantom power
to bias the condenser mic element, and possibly pre-amp the signal, as
well as matching it to the balanced line? Do I get lucky and find a
specialized integrated circuit that fits the bill exactly?
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| 3 responses total. |
scott
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response 1 of 3:
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Mar 1 23:13 UTC 1998 |
Well, the Radio Shack PZMs I remember from a few years back are already low
impedance balanced, such that you could just cut off the molded 1/4" plug and
solder on an XLR. I never did try to run one phantom power, but you could
run the little in-line preamp up to 12 volts, so soldering a 9v battery clip
on helps the dynamic range a bit.
(<sigh> they don't sell those little gems anymore... :( )
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n8nxf
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response 2 of 3:
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Mar 2 12:13 UTC 1998 |
Sounds like an electrit mic to me. Condenser mic and FET amp all in one
tiny package. Very common, very cheap, decent audio response. It,
however, requires a battery to power it. It has a pretty low Z output
so should not be quite as sensitive to picking up AC hum. Are you using
decent shielded cable to carry the audio signal?
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rtgreen
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response 3 of 3:
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Mar 3 10:08 UTC 1998 |
Thanks for the suggestions.
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