On Wed, 5 Mar 2003 18:15:21 -0800, "Mike Rehmus" <mike@no-spam-byvideo.com> wrote:

>"Neuman - Ruether" <d_ruether@hotmail.com> wrote in message

>news:3e6d00c8.3942402@newsstand.cit.cornell.edu...

>> On Wed, 5 Mar 2003 11:50:49 +0000 (UTC), "Maurice"

>> <maurice_vidents@btconnect.com> wrote:

>>

>> >Now that sounds logical and beggers the question, what size of capacitor

>> >(electrical and physical specs). I suppose the logical way to mount it

>would

>> >be by using another XLR plug in line, with (hopefully) the capacitor

>within

>> >that plug, connected between which pins?

>>

>> It is not an electrical problem (DC would not

>> cause hum...;-) but a mechanical one - better isolate

>> the mic from the vibration of the camcorder and the

>> hum will go away...

>Sorry but you are wrong here, David. It is well documented that the 3 VDC

>will cause some microphone to generate a hum.

>

>Take a look on the DV Mag website, the Jay Rose column. Sometime ago he

>discussed this issue and presented the solution.

I responded above that with some combinations (Sennheiser

MKE-300 with TRV900/VX2000) that the hum was due to

mechanical vibration and not to an electrical problem

(and this is true) - but I then looked again at the original

post, and realized I had forgotten to ask if the poster was

using the add-on Sony XLR adapter when having this problem

(likely, judging from parts of the post), or if not...

I do not know if this adapter passes through the DC to the

mic, though the adapter itself could possibly itself present

grounding problems with some mics...