Radio signal coming through pot - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, 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 20th August 2009, 07:35 PM   #1
Ang is offline Ang  United States
diyAudio Member
 
Join Date: Feb 2006
Location: Pittsburgh
Default Radio signal coming through pot

I get a radio station signal through my speakers depending on where the volume is set on my tube integrated. It occurs with seemingly random intensity at different positions of the volume control. I've pulled the pot out and sprayed it with deoxit but the problem remains. Would replacing it solve the issue? Thanks.
  Reply With Quote
Old 21st August 2009, 11:53 PM   #2
dmills is offline dmills  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Location: High Wycombe
The problem is unlikely to be the pot, and is probably poor design for RFI immunity.

a few hundred pf from whatever connection the RF is getting in on (may not be the obvious input leads) to case ground (with the leads kept short (as in way less then an inch)) may help matters or get the manufacturer to ship you something built right in the first place....

In fact a smallish cap across the pot might do it (depends a bit on the amp topology), recommending a value is tricky as that pot could be anything from 4K7 to a meg or more.

Regards, Dan.
  Reply With Quote
Old 5th September 2009, 03:15 AM   #3
Ang is offline Ang  United States
diyAudio Member
 
Join Date: Feb 2006
Location: Pittsburgh
Thanks for the advice. The pot is a Noble 100K pot. I'd like to try putting a cap across the pot as you suggested.

However, it has six connections, with multiple wire going into it. There are 8 connections coming out of the pot itself. I'd tried to find two with variable resistance while changing the volume, but that didn't seem to work. Do you know where I would connect the cap to be "across" the pot? Thanks.
Attached Images
File Type: jpg potclose.jpg (64.4 KB, 46 views)
  Reply With Quote
Old 5th September 2009, 06:22 AM   #4
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
Try make a connection between Volume pot thread/shaft to Ground
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com
  Reply With Quote
Old 6th September 2009, 02:10 AM   #5
Ang is offline Ang  United States
diyAudio Member
 
Join Date: Feb 2006
Location: Pittsburgh
Ahh, IC, thanks. Have a 10uF cap I'll try connecting from the shaft to the case.
  Reply With Quote
Old 6th September 2009, 04:13 AM   #6
diyAudio Member
 
Geek's Avatar
 
Join Date: Sep 2004
Quote:
Originally Posted by Ang View Post
Ahh, IC, thanks. Have a 10uF cap I'll try connecting from the shaft to the case.
No, try a 0.01uF or 0.1uF ceramic.

Your bypassing RF, not audio. Electrolytics are useless here.

Cheers!
  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
How to boost FM radio signal inside a steel building SharpyWarpy Everything Else 16 9th February 2011 05:50 AM
Signal inverter for radio project malfoye Chip Amps 0 28th November 2006 07:47 AM
related to radio signal MaXiZ Everything Else 0 25th February 2006 12:42 PM
How do I turn an high current signal into a line level signal?? sardonx Tubes / Valves 8 27th August 2005 12:16 PM
Creating a differential signal from a single-ended signal for bridged amps Peter Daniel Chip Amps 45 8th November 2004 01:47 PM


New To Site? Need Help?

All times are GMT. The time now is 12:35 AM.


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