SMD Cap Polarity, How to Tell? - diyAudio
Go Back   Home > Forums > Design & Build > Parts
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs 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.

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 9th February 2007, 12:59 PM   #1
diyAudio Member
DreadPirate's Avatar
Join Date: Jan 2006
Location: Athens, GA
Default SMD Cap Polarity, How to Tell?

Are there typically markings on part or board? If the cap is an input cap on an amp (Sonic Impact T-Amp, latest version), can you tell by what the leads go to?
  Reply With Quote
Old 9th February 2007, 05:31 PM   #2
diyAudio Member
Join Date: Sep 2004
Location: Central California
A polorized surface mount cap should have a line going across the body at the positive end. A few will have a +. The line will probably be silver or white in color. The PC board, if properly designed, should have some type of marking noting the positive end. I use a + on my boards, but I have seen many variations, done by others. If the cap is a ceramic or other type of non-polorized device, then no markings will exist, since the cap is...well...non-polorized.
  Reply With Quote
Old 10th February 2007, 06:26 AM   #3
diyAudio Member
unclejed613's Avatar
Join Date: Dec 2006
the yellow epoxy ones use a brown line across the positive end. black epoxy uses white or silver printing of a line across the positive end. the only time you can tell the correct polarity from where they connect to, is when one end goes to a power supply rail or other DC voltage
Vintage Audio and Pro-Audio repair ampz(removethis)
spammer trap: spammers must die
  Reply With Quote
Old 10th February 2007, 12:24 PM   #4
diyAudio Member
DreadPirate's Avatar
Join Date: Jan 2006
Location: Athens, GA
The one in question must be non-polar, reads the same in both directions and doesn't have any kind of stripe or marking.
  Reply With Quote


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
Ess AMT polarity? Help promitheus Planars & Exotics 1 13th July 2007 09:52 PM
Hi-Vi B3N polarity Gollum Multi-Way 5 5th July 2007 05:58 PM
GE 97F cap polarity ??? maynardg Tubes / Valves 0 3rd February 2007 09:20 PM
Polarity on OB sub icebear Subwoofers 3 29th April 2005 08:24 AM
LED polarity guitargully Solid State 4 12th January 2004 04:14 AM

New To Site? Need Help?

All times are GMT. The time now is 01:26 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2