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Stabilant 22 Contact Enhancer Application Notes

App. Note 25 - Plastic Element Pots

BACKGROUND

While plastic element potentiometers and faders have major advantages over the step type units, they do require some lubrication to extend their trouble-free life. Problems associated with malfunctioning or dirty elements include noise microphonics, miss-tracking of dual controls, and even dropouts. And almost totally neglected has been the effect of thin film contamination on the total harmonic distortion of the audio signal, including the tendency of this distortion to lie in the more easily audible high-order harmonics.

APPARENT ACTION OF THIN-FILM CONTAMINANTS

As an alternating current signal voltage passes through the zero voltage state, cu rent ceases to flow (we're assuming a purely resistive load here); if a thin film of contamination is present, current may not start to flow again until sufficient voltage has built up across the contaminant so as to break it down. The result is a small notch in the signal which in sound is not dissimilar to the notch distortion of a class B power amplifier. The characteristic sound ranges from a "grainy" quality up to a harsh "glassy brilliance" overlaying the music.

THE USE OF STABILANT 22/22A/22E

By applying a thin coating of water-diluted Stabilant 22 to the plastic element, the noise, dropouts, miss-tracking and these thin film distortion effects can be eliminated. While Stabilant 22A is thin enough to do the job, it is thinned with Isopropyl alcohol, (Stabilant 22E is diluted with ethanol) and many plastic elements are adversely affected by these diluants. Therefore, a suitable lubricant can be prepared by adding three parts of hot water to one part of Stabilant 22 (the concentrated form). Allow to cool before use. When applying, use only a small amount, perhaps one drop at the most, and vigorously cycle the fader to distribute the film the entire length of the track! If the film thickness is too great a phenomenon called hydroplaning could occur. This is where the contacts push a film of the lubricant ahead of them, causing it to increase in thickness until immediate contact is lost between the very-low pressure of the wiper fingers and the plastic element. This is a case where more is NOT better!.

A SIMPLE VERIFICATION THAT AUDIBLE DISTORTION HAS BEEN REDUCED.

If you want to do a comparison of the distortion effects of thin film-contamination, it is suggested that only one input channel be treated (including all the IC's, switches and connectors which should be treated with Stabilant 22a), and then and compared with an untreated channel. The difference us usually audible as a smoother, more musical sound, on the treated channel.

PRECAUTIONS

Again, keep the film thickness to a minimum. don't use Stabilant 22A or Stabilant 22E on plastic element faders unless their manufacturer OK's the use of isopropyl alcohol (commonly called isopropanol)., or in the case of Stabilant 22E, with ethanol.

REFERENCE

Reference is made to Technical Note Number 24 "Effects of Stabilant 22 on Harmonic Distortion in Connectors', Application Note 4, "Microphone Connectors", Application Note 3, "Schadow Switches", Application Note 11, "Recording Studios", and Application Note 12, "Broadcast Equipment".

Revision 2


Stabilants are a product of Dayton Wright research & development and are made in Canada

NSCM/Cage Code - NATO Supply Code 38948

15 mL of S22A has NATO Part # 5999-21-900-6937


The Stabilants are patented in Canada - 1987; US Patent number 4696832. World-wide patents pending. Because the patents cover contacts treated with the material, a Point-of-sale License is granted with each sale of the material.

MATERIAL SAFETY DATA SHEETS ARE AVAILABLE ON REQUEST


Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W. Electrochemicals Ltd.

Copyright 2003 - D.W. Electrochemicals Ltd. This note may be reproduced or copied, provided its content is not altered. The term "contact enhancer", 1983 Wright Electroacoustics.


NOTICE: This Application Note is based on customer-supplied information, and D.W. Electrochemicals is publishing it for information purposes only. In the event of a conflict between the instructions supplied by the manufacturer of the equipment on which the Stabilant material was used, and the service procedure employed by our customer, we recommend that the manufacturer be contacted to make sure that warranties will not be voided by the procedures.

While to our knowledge the information is accurate, prospective users of the material should determine the suitability of the Stabilant materials for their application by running their own tests. Neither D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or any consequent damages, howsoever caused, based on the use of this information.

Stabilant, Stabilant 22, and product type variations thereof are Trade Marks of D.W Electrochemicals Ltd.

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1 x Stabilant 22S 50mL Bottle
1 x Stabilant 22 15mL
1 x Stabilant 22 100mL
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1 x Stabilant 22S 100mL Bottle
1 x Stabilant 22 50mL
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Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

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Stabilant 22
APPLICATION NOTES
1. Electronic Equipment
2. Computer cards
3. Schadow switches
4. Mic connectors
5. RTS & Dual plug patch bays
6. Biomedical Electronics
7. Computing & Peripherals
8. Cable TV
9. Robotics
10. Environmental Impact
11. Recording studios
12. Broadcast equipment
13. Mobile Radio
14. Educational computing
15. Stereo systems
16. Aid to IC insertion
17. Navigational equipment
18. Card edge conn. problems
19. Complex process control
20. Automotive service
21. Gold plating/solder alloy
22. Very high humidity
23. High current thermal runaway
24. Car stereo systems
25. Plastic element pots.
26. Farm machinery & trucks
27. Model & hobby
28. RF case seals
29. Outdoor environments
30. Computer crashes
31. Relays & switches
32. Silicone problems
33. Tin-plated contacts
34. Solder flux & resin residue
35. Post application color tinting
36. Aircraft connectors w/ flurosilicones
37. Avoiding unsafe solvents
38. S22 R&D Design Goals
39. Stabilant use on PLCC's
40. Sensor problem solution
41. Repair of flood damage
42. Marine electrical & electronics
43. All Cameras & Video Equipment
44. SCSI removable SCA drives, caddies & connections
45. Home Theater & Computer Connectors

Some of these application notes are repetitive of material in other application notes. We realize this. But some were written as a reference to a contact problem in a particular field or application.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
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Stabilant 22
REVIEWS
Over the years, Stabilant 22 has been highly parsed in publications that target a wide range of electronics applications including:
* Andrew Marshall's Audio Ideas Guide
* BYTE Magazine (7 articles)
* Windows Magazine
* Q.S.T. Amateur Radio
* Model Railroads (2 articles)
* Motor Magazine
Stabilant 22
TECHNICAL NOTES
1. MSDS - Stabilant 22
2. General Information
4. MSDS - Stabilant 22A
5. MSDS - Stabilant 22E
9. MSDS - Stabilant 22L
20. Military Applications
21. Elastomer Compatibility
22. Effectiveness of Stabilants
24. Connector Harmonic Distortion
39. Signal rise time

There are gaps in the sequence numbers below because some Technical Note s were written by the manufacturer for specific companies and are confidential.

NOTICE: This data has been supplied for information purposes only. While to our knowledge it is accurate, users should determine the suitability of the material for their application by running their own tests. Neither R.A.L. Audio Services, D.W. Electrochemicals Ltd., their distributors, or their dealers assume any responsibility or liability for damages to equipment and/or consequent damages, howsoever caused, based on the use of this information.
Stabilant
Stabilant 22 Contact Enhancer

Stabilant 22 Contact Enhancer

We carry the complete line of Stabilant products. Looking for something not listed here? Please contact us.

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