Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Toggle Switch Contact Type and Rating
Toggle Switch Contact Type and Rating
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
Thread Tools Search this Thread
Old 12th February 2009, 01:54 PM   #1
Seraph is offline Seraph  United States
diyAudio Member
Seraph's Avatar
Join Date: Mar 2007
Location: on the sacred planet still
Default Toggle Switch Contact Type and Rating

I am having to replace a set of toggle switches on a preamp and have been trying to locate some quality parts. One thing I would like to mention off the bat is when you get intermittent or complete loss of a channel and all else have checked out, look into the condition of the toggle switches, if your unit uses them in the signal path; i.e., in lieu of a selector switch. Better yet check out the toggle or any other sort of switch you have first to ensure they are working properly. These can be pernicious culprits. Sometimes a cleaning is all that's needed but in case of a sealed switch, the only remedy is replacement.

OK on with the question. When selecting a toggle switch that will be placed in "low level" signal as in a preamp, what are the ideal characteristics of the switch in terms of contact metal, voltage and current rating? Correct me if I am wrong but there is hardly any current in line level signal and p-p voltage may not exceed 2-3 V. High quality switches are available with very low contact resistance made of silver that are rated for high current and voltage. What are the Pros and Cons of using toggles that can withstand high voltage and current Vs those that are rated for much less current and voltage in this context? Logic would tell me the latter should be used in line level signal but why? What are your brand name and model recommendations for use in this application?

Best regards

  Reply With Quote
Old 12th February 2009, 05:32 PM   #2
boywonder is offline boywonder  United States
diyAudio Member
boywonder's Avatar
Join Date: Jan 2008
Location: So.Cal.
I just finished buying some small toggle switches and went through this same exercise.

Searching Mouser/Digikey, etc. Turns up two basic flavors:

Silver usually rated at 6A/125V or 3A 250V

Gold usually rated at .4VA @ 28V max (these sound like signal level switches to me)

One disadvantage of using the silver high level switches for signal level is that silver corrodes rather easily, so over time contact resistance goes up. This is less of an issue with gold, since it is so corrosion resistant. Silver is a better conductor than gold, but will build an oxide layer far quicker than gold and become less conductive. If the switch is cycled regularly, this tends to wipe the contacts and delay corrosion to some extent.

The search button is your friend; IIRC there are several posts on this subject.
  Reply With Quote
Old 12th February 2009, 06:46 PM   #3
Seraph is offline Seraph  United States
diyAudio Member
Seraph's Avatar
Join Date: Mar 2007
Location: on the sacred planet still
Right and in the menatime I have read some posts on the subject. I agree that gold (properly plated) over copper or silver is the best bet. Silver tarnish is best avoided.
  Reply With Quote


Toggle Switch Contact Type and RatingHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
b&k st-140 toggle switch replacement thezaman Solid State 4 11th August 2013 04:28 AM
Toggle Switch Guards??? Zero Cool Everything Else 4 11th December 2007 04:55 PM
illuminated toggle switch schumpe Parts 6 3rd July 2007 05:33 PM
toggle switch with LED on tip for t-amp mod? gychang Class D 4 18th September 2006 05:54 AM
What type of toggle switch when driving with batteries? captain Chip Amps 2 15th November 2004 05:53 AM

New To Site? Need Help?

All times are GMT. The time now is 03:35 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio