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Cornet2 capacitors - part substitution for discontinued Digikey stuff

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MaskdBagel

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Cornet2 capacitors - part substitution for discontinued Digikey stuff
« on: 31 Aug 2010, 06:08 pm »
Looks like Digikey doesn't have the parts anymore for C100 and C101. I have a couple of .01uf 630V caps, but since the ones in the parts list are rated for 2kV, I'm not sure these will work. Am I OK putting these in the spots for C100 and C101? Thanks!!
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poty

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #1 on: 31 Aug 2010, 07:55 pm »
It depends on manufacturer and type of the capacitors. Many types do not allow the same voltages for even low frequencies compared with rated DC.
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MaskdBagel

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #2 on: 31 Aug 2010, 08:06 pm »
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poty

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #3 on: 31 Aug 2010, 09:03 pm »
The 630V version capacitors are rated 630VDC! For AC they are rated only 250VAC! For C100 they are theoretically OK, but in practice I'd not take the risk. (C100 works in 240VAC, C101 - around 540VAC).
The second choice is closer, but the rated voltage for AC is 500VAC.
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MaskdBagel

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #4 on: 31 Aug 2010, 10:14 pm »
Cool. Good to know this stuff. Looks like this one will work. It's good up to 750VAC.
http://www.mouser.com/ProductDetail/Cornell-Dubilier/940C30S1K-F/?qs=wE98CiVmOw5ePFogrQjHvA%3d%3d
Is this what I need, then, you think?
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poty

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #5 on: 1 Sep 2010, 07:48 am »
The last founding is OK, but size...
Why you do not try ceramic capacitors? The type of caps have the appropriate sizes and ratings in AC. For example:
http://ru.mouser.com/ProductDetail/Panasonic-Electronic-Components/ECK-A3A103MEH/?qs=sGAEpiMZZMt1mVBmZSXTPHHhXCZzqOLWEyXkzN3%2fkK0%3d
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MaskdBagel

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #6 on: 1 Sep 2010, 04:44 pm »
Even better. Yes, I was concerned about size. I searched for Poly Film before since the Digikey part was, but I guess there's no reason not to use ceramic. Thanks for all the help. :)
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poty

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #7 on: 1 Sep 2010, 07:22 pm »
Cornet 2 has in its BOM list ceramic caps for C100, C101:
0.01uF 2kV 2 P11423CT-ND C100, C101

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P11423TB-ND
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MaskdBagel

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Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #8 on: 1 Sep 2010, 08:18 pm »
 :duh:
I'll see myself out...
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hagtech

Re: Cornet2 capacitors - part substitution for discontinued Digikey stuff
« Reply #9 on: 6 Sep 2010, 02:22 am »
I have from alternates for C2...

Heat Sink = #HS972
LED = #754-1235
2SC3942 = TIP50
0.01uF AC = 495-1301
LED = 754-1235
1nF = BC1659
Mono Switch = 360-1791

jh
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