Main Forums >> DIY, Electronics, Studio Design & Acoustics

Martin WalkerModerator
Watcher Of The Skies

Reged: 28/02/01
Posts: 19722
Loc: Cornwall, UK
Noisy Pots - a Practical Before/After Cleaning Session
      05/11/09 01:47 PM
Given how many of us suffer from the occasional noisy pot, here's a before/after story from my own recent experience.

For the last few months my MIDI controller keyboard had been developing a dodgy modwheel - it worked fine from about half way up its travel, giving me smooth and gradual MIDI output However, in the first part of its travel it not only glitched but had become dirty enough for the pot's wiper to disconnect itself from the track and give intermittent full value glitches.

Even moving it anywhere in the bottom half of its travel and leaving it there finally resulted in glitching when playing the keyboard, simply due to the vibration.

Opening up the keyboard proved not be the nightmare I was envisaging (only about a dozen screws to remove in all) and a quick squirt of DeOxit followed by a few moves back and forth over the full travel of the modwheel helped a great deal.

However, after leaving the excess DeOxit to evaporate I was still left with the occasional crackle, so I applied another squirt and wiggle (love these technical terms!) and this cured the problem completely.

In all it only took me about twenty minutes, and you can see the before/after results of recording a steady modwheel move from minimum to maximum in the screenshot below (before on the left, and after on the right):

Notice in the left hand 'before' image the spiky noise generated by the dirt, and the big missing chunk of MIDI data in the lower part of its travel, compared with the comparatively smooth curve of the 'after' image on the right.

The moral of this tale is not to put up with noisy pots until they get really aggravating - a little squirt can sometimes work wonders!


Steampunk Shruthi SDE | Mad Scientist mode

Post Extras Print Post   Remind Me!     Notify Moderator
Rate this thread

Jump to

Entire thread
Subject Posted by Posted on
* How Can I Stop My Pots & Switches Crackling? Martin WalkerModerator 16/03/09 02:28 PM
. * Noisy Pots - a Practical Before/After Cleaning Session Martin WalkerModerator   05/11/09 01:47 PM
. * Re: Noisy Pots - a Practical Before/After Cleaning Session mjfe2   09/01/12 12:14 PM

Extra Information
0 registered and 16 anonymous users are browsing this forum.

Moderator:  David Etheridge, James Perrett, zenguitar, Martin Walker, Forum Admin, Hugh Robjohns, Zukan, Frank Eleveld, SOS News Editor,  

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Thread views: 40546

June 2016
On sale now at main newsagents and bookstores (or buy direct from the SOS Web Shop)
SOS current Print Magazine: click here for FULL Contents list
Click image for June 2016
DAW Techniques


Home | Search | News | Current Issue | Tablet Mag | Articles | Forum | Blog | Subscribe | Shop | Readers Ads

Advertise | Information | Privacy Policy | Support | Login Help


Email: Contact SOS

Telephone: +44 (0)1954 789888

Fax: +44 (0)1954 789895

Registered Office: Media House, Trafalgar Way, Bar Hill, Cambridge, CB23 8SQ, United Kingdom.

Sound On Sound Ltd is registered in England and Wales.

Company number: 3015516 VAT number: GB 638 5307 26


We accept the following payment methods in our web Shop:

Pay by PayPal - fast and secure  VISA  MasterCard  Solo  Electron  Maestro (used to be Switch)  

All contents copyright © SOS Publications Group and/or its licensors, 1985-2016. All rights reserved.
The contents of this article are subject to worldwide copyright protection and reproduction in whole or part, whether mechanical or electronic, is expressly forbidden without the prior written consent of the Publishers. Great care has been taken to ensure accuracy in the preparation of this article but neither Sound On Sound Limited nor the publishers can be held responsible for its contents.
The views expressed are those of the contributors and not necessarily those of the publishers.

Web site designed & maintained by PB Associates | SOS | Relative Media