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Re: Zoom H4 modification.

Subject: Re: Zoom H4 modification.
From: "Klas Strandberg" klasstrandberg
Date: Sat Feb 17, 2007 4:35 pm ((PST))
At 01:03 2007-02-18, you wrote:
>Klas,
>
>That's great news.  Will you offer the H4 with EM21 capsules for sale,
>or sell the parts plus instructions so others can perform the
>modification?

Hi!
I have considered that, but it takes a few hours to make it +
material. I'm not sure it's worth it, except for the one who really
wants a small unit with precisely the features of such a
recorder.  Another way is to remove the original mics and insert a
3,5 mm PIP input instead.

I have seen the list you propose and read about the
modifications.  The results of the mod's seem to vary. If the best
solution is to use an external power pack, I'll do that.

Klas.



>There's an active forum of Zoom H4 users at www.2090.com
>They have identified the internal power supply as the source of
>annoying preamp noises.  Apparently the preamp picks up RF
>interference generated when the H4 draws power to periodically write
>data to the flash memory card.
>
>The forum participants have devised two fixes.
>
>One approach is to use an external battery for power.  If input
>voltage stays above 6VDC, the H4 does not generate the unwanted noises.
>http://www.2090.org/zoom/bbs/viewtopic.php?t=3D7937
>
>The second solution is to add capacitors to reduce noise when running
>on the voltage provided by the internal AA cells
>http://www.2090.org/zoom/bbs/viewtopic.php?t=3D7886
>
>Of the two approaches, the external battery seems to result in better
>recordings.  Plus there is no need to open the H4, which voids your
>warranty.
>
>H4 owners: Please verify that extraneous noises are reduced or
>eliminated when recording on external power (AC power or external
>battery).  Thanks!
>
>--oryoki
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>

Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email: 
website: www.telinga.com







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