solving hum problem using external mic with camcorder - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 14th March 2007, 07:40 AM   #1
diyAudio Member
 
Join Date: Mar 2007
Default solving hum problem using external mic with camcorder

Hi -

I hope I am posting in the right forum, & if not, apologies...

I am trying to use an external electret condenser mic with my Sony camcorder's external mic-in connector which has "plug in power".

It works great if I am running on batteries; but generates bad 60Hz hum if running on AC power. The microphone itself has no AC connection, so there is no possibility of the typical ground loop problem.

I do notice that the hum varies quite a bit depending on how I actually hold the camcorder; for example touching the metal plate that holds the tripod screw often makes the hum go away, if the mic is clipped to my own body, but not if the mic is across the room. I have heard that sony uses "floating ground" in its camcorders; perhaps this is what makes it so sensitive?

I tried two different mics - on a capsule only, running on the camcorder's plug in power. THe other is an AudioTechnica At-35s, which is battery powered, and which supposedly is designed for camcorders. Both mics work fine on battery but both hum when using the camera on AC power. So I doubt it is the mic that is the problem.

Any suggestions as to how to get rid of this hum? I have considered but not yet tried the following:
1.) cut into the power supply cord and add some more filtration?
2.) add blocking cap to the connection between camera and mic?
3.) ground the shielded cable that connects to the mic to the tripod socket instead of just the sleeve of the connector?

I am eager to try some things but don't want to take a risk of damaging the camcorder. Any suggestions would be appreciated.

Thanks in advance.
- David
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
combining different speaker wires (weird external crossover problem) Ang Everything Else 2 19th January 2007 08:55 PM
Clock problem - (external wallwart PSU) ash_dac Digital Source 0 23rd April 2006 07:53 PM
Camcorder photos Gunders Tubes / Valves 1 22nd March 2003 07:49 PM


New To Site? Need Help?

All times are GMT. The time now is 05:53 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2