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Old 16th November 2010, 01:50 PM   #11
Cristi is offline Cristi  Europe
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Wouldn't be more easy to tell us the brand/model and google-it to find about that cap ? or at least some pictures ?
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Old 16th November 2010, 06:38 PM   #12
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Quote:
Originally Posted by wwenze View Post
"right after the connection between the AC plug and the power supply board"

I interpret it as the capacitor is on the power supply board, and after a rectifier.
The capacitor is actually before the transformer primaries
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Old 16th November 2010, 06:44 PM   #13
hags is offline hags  United States
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Post a picture.
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Old 17th November 2010, 07:20 PM   #14
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[IMG]C:\Users\Mike\Documents\Youcam\Capacitor.jpg[/IMG]

This is the capacitor that I took out of the power supply
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Old 17th November 2010, 07:26 PM   #15
SY is offline SY  United States
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Difficult to see it on your hard drive.
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Old 18th November 2010, 04:54 PM   #16
macboy is offline macboy  Canada
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A 200uF 200 V Electrolytic across the line and neutral? No, you are mistaken. You missed the bridge rectifier. This is the filter cap for that, and it is on the front end of a SMPS.

The biggest cap I have ever seen across the line is 2.2uF, and it was (of course) an "X" rated cap and was about 2 x 1 x 0.5 inches big.
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Old 18th November 2010, 04:59 PM   #17
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by macboy View Post
The biggest cap I have ever seen across the line is 2.2uF, and it was (of course) an "X" rated cap and was about 2 x 1 x 0.5 inches big.
J. Curl recommends upto 10uF across the mains Live to Neutral for RF attenuation and a small amount of harmonic reduction.
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Old 18th November 2010, 06:52 PM   #18
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WAIT, I looked at the PCB wrong. the 200 uF cap is in front of the rectifier, with an inductor and another 2200 uF cap. The cap between live and neutral is a non-polarized 0.1 uF 250V blue capacitor (I don't know the material, but it's blue and rectangle-shaped).

Sorry for that, everyone
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Old 19th November 2010, 08:56 AM   #19
AndrewT is offline AndrewT  Scotland
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Hi,
check that blue boxed 0.1uF.
Has it got X1 or X2 printed on it?
Designed especially to go from Mains Live to Mains Neutral.
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Old 19th November 2010, 06:11 PM   #20
ChrisA is offline ChrisA  United States
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Quote:
Originally Posted by diymixer View Post
hey all-

I was dissecting my old Laserdisc player for parts when I saw a massive 200 uF 200V electrolytic connecting Active and Neutral right after the connection between the AC plug and the power supply board. What is the capacitor for and is it a good idea to implement it into a mixer's power supply?
This can't be right. If you put AC into an electrolytic cap it will not last long, a few seconds I'd guess. If the cap still looks like new then there must be a rectifier someplace.
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