Re: PTR2 Humming sound through headphones when connected to mains
- From: Michael Lang <michael.lang@xxxxxxxxxxx>
- To: "Ankers, Dave (UK)" <ptr1-users@xxxxxxxxxxxxx>
- Date: Thu, 15 Mar 2007 13:26:11 +0100
Hi Dave,
As you discovered, a lot of PTR1s and PTR2s produce this humming noise,
when they're used with the AC adapter. But the same is true for a lot of
other portable recorders, quite a few Sony Minidisc recorders for
instance. I always make microphone recordings with the rechargeable
battery and since one can record for up to eight hours, when one uses
a CF card, this shouldn't be a problem for most people.
<*** Michael Lang ***>
You wrote:
> Hi all,
> When I connect my PTR2 to the mains I hear a humming noise through the
> headphones(Bose noise reduction). If I plug in my external mic(Sony
> ECMMS907) and touch the metal, the humming stops. The same happens if I
> plug in a double ended line in lead and touch that.
> I also use a Re-tel Intelligent recording interface to record telephone
> conversations. When this device is used with the mains connected to the
> PTR2, there is a loud buzzing on the phone which is even louder on the
> other end. Once the mains is disconnected from the PTR2, no humming or
> buzzing can be heard.
> I have returned the unit to the RNIB, and they tested it but could not
> hear any humming through the headphones(Standard headphones). I have
> also tested Brian Hartgen's PTR2 and that does exactly the same as mine.
> It is a shame to have to disconnect the mains when using the unit, has
> anyone else experienced this?
> Regards,
> Dave Ankers
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