Tweakers' Asylum

Most equipment generates its own noise.

71.131.197.3

Al Sekela

In Reply to: RE: Add some carbon fiber to the face plate. posted by HumanMedia on May 30, 2007 at 18:34:10

Filtering the AC for audio is complicated because most components have power supplies that generate their own RF noise, and allow RF noise from the line to get inside. Putting the choke filters as close to the individual outlets as possible will reduce the effects of generated noise on other components in the system, and reduce the ability of the local wiring to pick up the noise from other components.

Follow Ups:

RE: Most equipment generates its own noise. - HumanMedia 21:03:31 06/04/07 (3)
So the same applies to the placement of a RC bridge?

I have the output of a balancing transformer going out to a duplex outlet socket.
The transformers output is wired into the back of outlet 1, which has my CD player plugged into the front. The second 'downstream' socket has two paralleled Auricaps betwenn hot an neutral with a 100ohm ceramic resistor on each negative leg, in the front I have a powerboard plugged in which feeds my lesser equipment (DVDplayer, table lamp, Playstation).

My reasoning is that the balancing transformer attenuates RFI in from the mains straight to the CD player (in socket 1), then the RC bridge separates the cd player from the other noisy stuff plugged into the powerboard.

Is my reasoning correct?
Since a source of noise is from the second outlet, Is this the best place to have the RC bridge or alternativeley a choke (replacing the caps and resisistors)?
- The R-C network loads the AC line. - Al Sekela 10:36:00 06/07/07 (2)
  I expect it would be less effective than a choke as a sink for locally-generated noise.
  - RE: The R-C network loads the AC line. - HumanMedia 17:35:33 06/07/07 (1)
    So the placement position is correct, but a choke would be better than the paralleled RC's?
    
    Last night I pulled the RCs out of the output stage of the balancing transformer and the sound became noticeably rougher in the highs. So its doing something in that position, so putting a choke in the same spot would probably be better again?
    - Could be. I don't know enough to give exact guidance here. - Al Sekela 15:46:03 06/10/07 (0)
      The resistor in your R-C networks may be damping some resonance in the balanced transformer. A choke might be better or worse for this application.

Post a Followup:

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.

This post is made possible by the generous support of people like you and our sponsors:

VH Audio