Mechanical damping of output caps? - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips

Construction Tips Construction techniques and tips

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 21st March 2013, 11:02 AM   #1
diyAudio Member
 
Join Date: Feb 2013
Default Mechanical damping of output caps?

Can anyone advise if gluing output caps to the circuit board with electrical grade silicone is a good idea or not. I've seen preople mount these on wood before and use glue, but I've no idea what sounds best. should I just not bother and leave them as is.

Thanks
  Reply With Quote
Old 21st March 2013, 11:34 AM   #2
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
Sound isn't the issue (unless they are incredibly poorly built caps with rattly foils)- the issue is reliability. You want the caps secured so that they don't shake loose over time, breaking leads and causing component failure.
__________________
You might be screaming "No, no, no" and all they hear is "Who wants cake?" Let me tell you something: They all do. They all want cake.- Wilford Brimley
  Reply With Quote
Old 21st March 2013, 01:09 PM   #3
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Done as Sy said to combat vibration, electrolytics both through hole and SMD always fall of during vibration testing otherwise, large size mass, small leads.
  Reply With Quote
Old 21st March 2013, 03:04 PM   #4
diyAudio Member
 
Join Date: Feb 2013
Thanks guys :-)
  Reply With Quote
Old 21st March 2013, 07:03 PM   #5
diyAudio Member
 
PlasticIsGood's Avatar
 
Join Date: Mar 2012
Location: Bradford
This raises the related question of whether a long, thin, heavy cap should be soldered tight to the board, or whether a gap should be allowed for it to flop about.

Sideways shaking tends to lever out the leads if the cap is close to the board. I assume that's why hard glue is used rather than damping material when this is so.

If left floppy, they just need propping up with something stiff enough to keep them in place, but squidgy enough not to act as a lever.

So what's all that silk-filled electrolyte stuff about then? And why has this Sony got a damping pad across it's twin main PS caps, that would serve only to increase the load on the leads, were the caps not glued in place?

Last edited by PlasticIsGood; 21st March 2013 at 07:17 PM.
  Reply With Quote
Old 22nd March 2013, 07:36 AM   #6
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Flat to the board is best, limits any movement, any that are raised from the boar would fail an IPC-610 quality inspection. Most audio gear is not going to experience the vibration levels that you find in equipement used in cars planes, on motor housings, generator sets etc so it shouldn't be a problem. Silicone based adhesion is preffered as it adds some damping, further more the compounds can vary to cater for different vibraion levels and frequemcies, a gen set at 1500 rpm has a different vibration signiture to a jet.
harder gues are often used in lower vibraion units to help keep the devices close to the board during the assembly cycle, even snap fit capacitors can sahke loose before soldering during the movements around an assembly line, and often both may be used.
  Reply With Quote
Old 1st April 2013, 11:08 PM   #7
AVWERK is offline AVWERK  United States
diyAudio Member
 
Join Date: Jan 2004
Location: OC,Calif.
There is a double sided clear sticky tape that is used in glass store fixtures. They join right angle glass together and is tougher and stickier than the soft foam style types.
You can find it at commercial glass shops
This along with ty-wraps is the best, but not necessary since your not shipping hundreds of product that gets tossed around like a football or like in the movie. " Pet Detective "
  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
B1 without output caps xecluded Pass Labs 5 14th January 2012 03:12 PM
Output caps - or no output caps? Earfanatic Headphone Systems 26 26th October 2011 04:46 AM
removing HF damping pF caps for guitar PRNDL Tubes / Valves 3 24th March 2007 12:00 AM
Effect of output Stage Configuration on Damping Factor Workhorse Solid State 4 11th September 2005 01:14 PM
output coupling caps, yes or no? catrafter Digital Source 1 8th May 2003 01:34 AM


New To Site? Need Help?

All times are GMT. The time now is 06:33 PM.


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