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Posted by EHSTC on 03/26/07 20:52
On Mar 26, 4:37 pm, "Richard Crowley" <rcrow...@xp7rt.net> wrote:
> "David" wrote ...
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> > I tried connected a battery powered external lavaliere mic (Audio
> > technical ATR-35s) to my Sony DCR-PC9 camcorder via the "plug in
> > power" mic - in jack. It works great when the camcorder is running
> > on batteries, but when the camcorder is plugged into the AC adapter
> > there is a lot of hum. (60 Hz hum, not hiss). Judging from what I"ve
> > read on other sites, this is a fairly common problem.
>
> > I tried various things to deal with the hum. I noticed that if I
> > grounded the case of the Sony (touching the metal tripod socket to a
> > water pipe, for example) the hum completed disappeared. I am thinking
> > of rigging up a wire with an alligator clip so that I have an easy way
> > of making the connection from the camera housing to something that is
> > electrically grounded.
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> > Is there any risk of hurting the camcorder by doing this? Should a
> > resistor or fuse go in series with the grounding wire so that if
> > something goes wrong the current flow over the grounding wire is
> > limited?
>
> It would be a bit safer to put a 10-100 Ohm resistor in line
> and/or a 1/4A fuse, etc. You can buy pre-wired in-line fuse
> holders at auto parts stores, etc.
>
> Same thing happens with laptop computers. The "wall wart"
> (or "cord lump") power supplies that come with those things
> are notoriously noisy (RFI noise).
>
> I have found a similar problem even when running on batteries
> with the digital hash from the flip-out viewfinder LCD screen.
> Must make sure any mic lines are routed *away* from the
> viewfinder LCD.- Hide quoted text -
>
> - Show quoted text -
In my expriance with sound systems, and cameras, and recording, ive
found that if the plug is grounded, than get on of those 3
prong-2prong adapters. that way it cuts the ground loop. Ya as
mentioned above, if im recording onto my laptop, i cant do it with out
it being unpluged.
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