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In Reply to: RE: RC Snubber 0.1uF 250VDC with integrated R100 resistor vs. 0.1Uf 250VACDC Wima MP3-X2 Cap posted by Ugly on July 26, 2016 at 17:14:09
Just says 250 VDC, meaning 250 volts dc (direct current) nothing about an AC rating, as printed on the Kemet RC Snubber.
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dcuhl, the 250v does say something about the ac. We have 120v ac which is RMS voltage. There is a calculation to find out what DC voltage rating will be adequate. Caps, much larger than .1 can or do improve bass performance and spacial stuff a bit. One friend of mine when I gave him a large cap for across the line said it sounded tube like. 250V is safe for 120ac as long as it is X type safety cap. If you have a 250v or higher film cap around I doubt if it will fail in the time you take to hear it although technically you should always use the X type. Digikey has loads of them. T EDIT The factor for dc voltage for peak dc voltage, not peak to peak is 1.414. 1.414x120=170 so 240v is fine. I'm almost 100% certain peak to peak is not used. I have used 240v caps for years and years.
Edits: 07/28/16
The real question is, why the integration of a 100r in the design of Kemet's Snubber, all things being equal? Would using the Kemet, in this application, be more beneficial over the Wima;s or will it be of little or no auditory improvement. Won't really know without trying both I know, but like I say, I'm re-upping my supply and thought I'd try the Wima's since Al Sekala seemed to be such a fan of these specifically, for this purpose, as I recall, and found the RC Snubbers on the Parts Connexion website, which caused the curiosity. Thanks
Maybe this will help. Check link...
old guy 42 or anyone else willing to respond, according to the link the resistor is to be wired in series with the X2 cap. Should the resistor be in line before or after the capacitor and what of adding a varistor to reduce start-up spike(s). The above electrical components will be added to an AC outlet that is being installed into an 1.8kw Topaz noise isolation transformer, to power my front end components.
Thanks to all.
If the signal is propagating left to right through the RC filter, with the R in series and the C in parallel, the unfiltered signal would be on the left before it gets to the R and the filtered signal would be on the right after passing the C.
You have to decide where you want the filtered and unfiltered side to be at in your circuit and configure the component arrangement accordingly.
I could place the varister before the isolation transformer and slow the in-rush current or I could place it between the transformers output and the AC receptical and slow the in-rush current there. I'm inclined to slow it prior to the transformer. Though I don't want to create a "choke point" or current limiting, though it may be unavoidable. Is there an optimal place, to your line of thinking and is there an educated guess as to how its presence will effect the sound in the end?
perform the same function of absorbing an in-rush spike and that the varister is kind of over kill? or am I wrong on this?
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