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bullpeters 4th December 2012 01:23 AM

Is this going to be adequate: MKP Power Caps

wintermute 4th December 2012 01:52 AM

Hi, I fixed the link. You are going to have to give more information... adequate for what?

You will need to specify where in the PS it will be used, and probably expected load (if it is used for smoothing duties).


bullpeters 4th December 2012 06:59 AM

Yeah thought so. Basically 50 uF, valve rectifier, 220 uF to OT, first stage regulated. The Bevois Valley. It's taking sometime :). So yes, smoothing cap. I have a good deal on some MKP caps, 1000v, but the postage will kill me. These look cheap. Pls don't sugest electrolytics, I have considered them and I am eating my options :)

Triodethom 4th December 2012 04:22 PM

If there is a choke between the value rectifier and the second cap (220 uF) then yes or at least a resistor to control the current peaks . My preference is choke. Since these are close to you then I would use them.

AndrewT 4th December 2012 04:32 PM

You could try to find motor run capacitors near to you.
Available in 250Vac and 440Vac versions. considerably cheaper, since motors don't have any Audiophool parameter requirements.

Pano 4th December 2012 04:43 PM

The item is a Motor Start cap. For this use would Motor Run be any better? They'd cost more for the same values, right?

AndrewT 4th December 2012 05:19 PM

motor start are rated for short term voltage loading.

I have no idea if there is a de-rating that can be applied for continuous duty.

Check the manufacturer's datasheet for advice on changing from AC voltage rating to continuous DC voltage rating.
They are unlikely to state Vdc rating = 1.4* Vac rating

Pano 4th December 2012 06:26 PM

I have looked. So far can't find any DC ratings at all. Is that good or bad?

bullpeters 4th December 2012 07:51 PM

Yes there is a choke in between

metalsculptor 6th December 2012 03:35 AM

Why would you use a motor start capacitor (bipolar electrolytic) if a conventional electrolytic capacitor is unsuitable? 250V motor run capacitors often have a 600VDC rating, insulation fatigues under cyclic potentials making the AC rating considerably less than the DC rating. A 50uF 250VAC motor run capacitor is about the same size as a 1950's vintage 50uF 400V electrolytic.

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