SMD Cap Polarity, How to Tell? - diyAudio
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Old 9th February 2007, 01:59 PM   #1
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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?
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Old 9th February 2007, 06:31 PM   #2
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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.
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Old 10th February 2007, 07:26 AM   #3
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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
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Old 10th February 2007, 01:24 PM   #4
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The one in question must be non-polar, reads the same in both directions and doesn't have any kind of stripe or marking.
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