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Re: 3.5mm recording input crackle

Subject: Re: 3.5mm recording input crackle
From: madl74
Date: Mon Oct 28, 2013 2:44 pm ((PDT))
> I assume what was meant by "unsuitable for field work" was that there's a=
 more suitable solution, but it's not in my price bracket.

Peter,

What I meant was to take the home environment into the field and keep the
Message: 3.
Subject: 5's clean and dry and with no movement.

As for crackle, the major source is with PIP. With low mic level audio,
slight misconnections only vary the level very briefly, but with 2V or so o=
f
DC PIP added, the slightest increase in contact resistance in a plug is
applied to over 0dB in DC volts, in a mic circuit handling under -60dB. Wit=
h
Message: 3.
Subject: 5mm jacks and sockets, only a tiny area of each connection makes 
contact,=

so any movement is likely to cause trouble.

I can remember when XLR plugs were coming into use instead of plugs twice
their diameter used by STC, Coles, etc. XLR's were designed by Cannon to be=

reliable and robust. This new range of "X" plugs incorporated a locking
mechanism (the "L") and resilient rubber mounting of the female sockets (th=
e
"R"). Instead of jack plugs with a single point of contact, the plugs meet=

in more than one area, usually using two sprung strips. Subsequently,
Neutrix (pronounced "noytricks") mounted both halves rigidly and made the
connectors resilient, and we have the present day XLR series.

David Brinicombe








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