Mundorf M-Cap Supreme as bypass cap? - Page 3 - diyAudio
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Old 5th September 2012, 07:10 AM   #21
MGH is offline MGH  United States
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Hi Frank, the non-inductive film caps where two separate opposite windings are in series (eg, Mundorf and Intertechnik Audyn caps) seem to be built like tanks and can handle high voltages. The 0.47 microF values are relatively affordable, but those 22 microF are quite pricey. Your right, those manufacturers do surely crow about their designs, and make you pay for it dearly!
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Old 5th September 2012, 08:37 AM   #22
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BTW frank, how critical is the temperature rating of these bypass caps? My tube amp does not get hotter than around 80 degree C or 176 degree F. Someone suggested I get the caps with very high temperature rating. Not sure why.
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Old 5th September 2012, 10:23 AM   #23
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Yikes, I looked at an older catalogue and some of the higher voltage units there from conventional manufacturers gave one sticker shock! So, I went on-line and looked at element14, used to be Farnell InOne, and was pleased to see Vishay and Epcos at reasonable prices: Vishay MKP1848S62010JY5F, 20uF, 1000V, about $AU11. So, there are units at sensible prices, and if you can drop the voltage requirements a bit you get more cap for your buck.

As regards temperature, I can't imagine you'll be placing these parts in the really hot positions, but if the worst comes to the worst, those units are rated up to 105deg C, operating, life of 100,000 hrs at 70deg C.

So, I reckon those parts should do it, to try out, from Vishay, etc -- forget the fancy stuff!

Frank
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Old 5th September 2012, 03:16 PM   #24
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Thank you! That is exactly what I was looking for. I always to have trouble getting the correct filter settings to narrow down what I'm looking for. Does the same capacitor come in 0.47 microF? Or should I get ceramics for both 0.47 and 0.01 microF? I tried searching that site, but I get so many listings, I don't know which to choose.
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Old 6th September 2012, 01:22 AM   #25
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I agree about these suppliers, they seem to keep fiddling with their websites, just when you get a handle on how to get around nicely, they up and change everything again, help!!

On the webpage I posted for that cap there was a link to the technical data sheet, a PDF, and that showed minimum value was 1uF. So no joy there. I altered the 'Select a Max' value for Capacitance to 0.5uF, and 'Select a Min' for Voltage Rating to 600V or so, and that showed me 2 reasonable units, Epcos B32674D8474K - EPCOS - CAPACITOR PP FILM, 0.47UF, 875V | element14 Australia, 850V, $3 and a Vishay BFC233814474 - VISHAY BC COMPONENTS - CAPACITOR PP FILM 0.47UF, 1KV | element14 Australia, 1000V, $5. Last step, changed Select Max for Cap to 10000pF, ie. 10nF or 0.01uF, and huge range of options, all film: Epcos B32652A103J - EPCOS - CAPACITOR PP FILM 0.01UF, 1KV | element14 Australia, and Evox Rifa PHE448RB5100JR06 - EVOX RIFA - CAPACITOR, 0.01UF, 1600V, 15MMP | element14 Australia, both less than $2. Here you could also consider ceramics, I was just looking at film, and over there it's a huge selection, mostly surface mount, but say try the Kemet C322C103JDR5CA - KEMET - CAPACITOR, 10NF, 1000V, X7R | element14 Australia for $3. I would recommend you straighten the leads if you get this, right angles or sharp corners are a no-no if you're trying to control HF energy.

Frank
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Old 6th September 2012, 06:48 AM   #26
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Wow. Thanks for doing the search. I would have been confused as hell with all the choices. All these caps look small enough to fit into tight space and keep the wire lengths to a minimum.
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Old 6th September 2012, 07:48 AM   #27
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No worries ...

Frank
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Old 7th September 2012, 12:02 AM   #28
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Hi Frank, will this 0.01 microF ceramic cap work just as well? The leads are straight on these cap. Temperature rating is not high as the Kemet, though.

562R5GAS10 - VISHAY CERA-MITE - CAPACITOR, 10NF, 1000V, Z5U | element14 Australia
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Old 7th September 2012, 01:08 AM   #29
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I wouldn't get too fussy about picking one versus another: that looks fine, the lead spacing in fact is a bit greater which may be the most important factor, if it reduces the length of wiring needed to get the component where it needs to be connected. The higher the frequency one's worrying about, which is what these small value caps are relevant to, the more important the precise physical orientation, shape and placing of things are, to get components to do what you want them to do!

Don't worry about how the leads come, a pair of needle point pliers can sort that out, don't be scared to bend them. And don't worry about neatness, making things look "nice" is a very low priority when you're trying to kill interference effects!

Frank
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Old 7th September 2012, 05:53 AM   #30
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Hi Frank, my main power supply caps are film caps (there are 12 of these 760 microF caps), no electrolytics in my amp. And these film caps have ESR of 1 mOhm measured at 10 kHz. The 20 microF bipass cap you referenced has 0.0095 Ohm, which is almost 10x higher than my main power supply caps:
http://au.element14.com/vishay/mkp18...f-5/dp/2133988
Won't the bypass caps affect the performance of the power supply caps in bad way?

Last edited by MGH; 7th September 2012 at 06:10 AM.
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