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In Reply to: RE: WIMA MP3-X2 safety cap firecracker. posted by Duster on November 04, 2014 at 18:00:48
Somebody emailed me from Europe (220V land) and asked about using the dIY version of the [Al Sekela] parallel AC filter there. I said I wouldn't. I like having more voltage headroom if you will. Someone in the thread you linked also recommended using 630V caps not those safety caps rated at 250 or 275. I'm not surprised to see that thread from 2011 and a burnt cap. Stuff happens.ET
Edits: 11/04/14Follow Ups:
Yep, you would think an experienced tweaker in Germany would know better.As for the WIMA MP3-X2 X2 AC power line noise filtering capacitor, I'm going to compare a WIMA MP3-X2 0.1uF 250V with the stock MKP type X-cap for a VansEvers Reference Model 12 Analog PLC. It's amazing how much sonic impact a very small value noise filter cap can make. I like the fact that the materials of the MP3-X2 involve more organic paper and resin. Al Sekela recommended the WIMA MP3-X2 as the only X2 cap he liked.
Do you have any experience of placing two conventional X2 caps in parallel like the unconventional Auricap Tweak?
TIA
Edits: 11/05/14 11/05/14
I never did that tweak. It's two .47's from hot to neutral as I remember. They were rated at 630V but were not safety caps. They are also polarity marked but only for "best" performance and will work connected either way. I use Auricaps as an upgrade on the Detail Magnifier now. Safety caps supposedly have a construction that can handle line exposure and voltage spikes better. Either an X or Y type would do when going from hot to neutral.Al's parallel filter was more complex and has four R/C/R strings with different a cap and resistor values in each string. He also then made a version with a resistor/inductor string from neutral to safety ground.
Parallel filters don't suffer from the drawbacks of a series filter but have their weakness too like most things there are pluses and minuses. There's a schematic on my site and prebuilt boards in the trader here with the inductor string. Sorry if that's an ad just trying to give you the most info.
ET
Edits: 11/06/14
I understand the method, as I've implemented the Auricap Tweak (two non safety rated 0.47uF 630V Auricaps placed in parallel across L and N) for digital applications for a number of years without issue. My curiosity is about placing two safety rated X2 caps in parallel (such as two 0.1uF 250V WIMA MP3-X2) rather than only one cap as usual. Even though Audience implements Auricaps for their Adept Response PLCs, I feel far less confident using non safety rated Auricaps within a high current PLC than I do within a very low-current draw digital transport, and a very low-current draw digital interface processor.
I don't see any issue with doing it.
ET
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