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Noise suppression capacitors

capo72

capo72

New Member
I need some help selecting noise suppression caps. I'm planning to build a DIY component rack with built in power strip implementing these caps as shown in this DIY article:

http://www.10audio.com/diy_power_conditioner.htm

I can't seem to find the same cap used here @ mouser where the author purchased them. I'm buying a few other cheap items from Mouser and would like to find some caps there also to help justify shipping. I blew up the picture in the article and from what I can tell it's a 250v 0.1 micro farad cap, but that's all i'm getting from it. Any help or other suggestions is appreciated. Thanx for your time,

Jeremy
 
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If these are going across the power line, I'd get 600 volters in there. Margin is good when dealing with the utilities.
 
While I agree that margin is good, take a look at the data sheet for the cap I suggested. It's specifically for AC "across the line" applications, and rated to 275VAC. Data sheet says that taking 600VDC is "permissible". I'd say the cap has a lot of margin for a country where you have 120VAC coming from the wall (hopefully). If you're really worried about it, go ahead and get larger voltage tolerant caps, but make sure you're reading it as VAC and not VDC. VAC is harder on caps, and they can tolerate less of it.

Good luck with the project!
 
So, all the money you pay for a Hydra gets you a handful of noise suppression caps and an MOV ? That's why I will stick with DIY balanced isolation transformers.
 
If they are marked by UL and other safety agencies, they have LOTS of margin - they're pulse tested at 2000-4000V! Use only AC safety rated caps, since they're designed for this use, and are guaranteed to fail in a SAFE mode. 'X' rated caps are designed for line-to-line use. 'Y' rated caps are designed for line-to-ground.
 
The person who wrote this article is NOT an electronics professional. He used the word "silicon" (the material transistors and IC's are made of) where he should have used "silicone" (a rubbery polymer).

* * * * *

In the application cited in the article, the use of safety caps is essential. Take the advice of Tom Bavis.

Fred
 
This thread is spot-on my problem!

I am working on a Marantz 2216. Thread cross-reference....

http://www.audiokarma.org/forums/showthread.php?t=205761

I have narrowed my noise problem to the noise suppression cap but when I visited my local electronics supply shop they advised that they could order the 'noise suppression cap' (about $10 and 2 weeks wait) and suggested that I just mod in a resistor and a 0.1 uf 250VAC cap in series. This cap goes across the on/off switch on the 2216.

My question here is 'can this be done?' or is there a reason why the 'noise suppression cap' should be purchased?

Oh, and I have phoned Mouser but there is a big ice storm in Texas, they are way understaffed and ever so nicely asked if I could call back ... to check out a $1.00 order I was OK with that.

Thanks
 
The Vishey noise suppression caps are just ordinary "X" AC line rated caps. Here is an article on their use:

http://www.justradios.com/safetytips.html

He is also has a good selection of both "X" and "Y" AC line caps:

http://www.justradios.com/X2capacitors.html
http://www.justradios.com/Y2capacitors.html
http://www.justradios.com/X1Y2capacitors.html

The creator of the DIY Hydra appears to be a bit of a hacker. Although I see nothing really wrong with what he did, I suggest you do a bit more research on DIY power conditioners. Here is one example:

http://www.geocities.com/jonrisch/surge.htm

Although I don't agree with a lot of Jon's thinking he is at least an experienced engineer.
 
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