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Old 23rd July 2009, 07:20 PM   #11
Renron is offline Renron  United States
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Christian,
as per your recommendation .068uF , I thought the caps were used as a buffer after the rectification to smooth out the remaining sinosidial wave. Or are they used to prevent the "ringing" of the diodes closing?
I am using MUR860 that I got from Jackinnj's website.
Should I just forget the caps and Rs and just use the diodes?

Thanks for helping me learn electronics.

Ron
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Old 23rd July 2009, 07:23 PM   #12
cviller is offline cviller  Denmark
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Quote:
Originally posted by Renron
Christian,
as per your recommendation .068uF , I thought the caps were used as a buffer after the rectification to smooth out the remaining sinosidial wave. Or are they used to prevent the "ringing" of the diodes closing?
I am using MUR860 that I got from Jackinnj's website.
Should I just forget the caps and Rs and just use the diodes?

Thanks for helping me learn electronics.

Ron

Yes, they are there for preventing ringing - so unless you have something else lying around, you might be better of leaving them out.
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Old 23rd July 2009, 07:29 PM   #13
Renron is offline Renron  United States
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Christian,
Thanks for being so fast!

Do you have any recommendations of the caps?
Obviously then, non-polarized would be the way to go. Now that I understand (somewhat) . How about Tantalum?

Ron
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Old 23rd July 2009, 07:29 PM   #14
grenert is offline grenert  United States
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Going by Hagerman's snubbers article, it looks like you only need one resistor and one capacitor per bridge, rather than one per diode. Could your board accomodate this?

As an aside, he explains the calculations to determine the optimal values for R and C in the snubber. I have not been able to determine if you could potentially be worse off choosing non-optimal values for these than leaving them out.

Ron, any capacitor used in this application will be small enough (well under 1 uF) that electrolytic capacitors aren't even a consideration.
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Old 23rd July 2009, 07:37 PM   #15
cviller is offline cviller  Denmark
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Cool article - I just skimmed it briefly, but it seems like he is looking at a single diode (half wave). He tries to justify that his calculations holds for full wave rectifiers too and he is probably right.
But I'm quite sure you still need a snubber per diode and in a normal full wave bridge you have four.
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Old 23rd July 2009, 07:55 PM   #16
Renron is offline Renron  United States
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I too read his article entitled, "Calculating Optimum Snubbers" thanks for the tip!
Well written as even I understood his theory and from my use of PSUDII confirms what he states.
This stuff is cool........

Grenert,
Are you saying that because the capacitance is so small , .068uF that it would be OK to use electrolytics as the caps in a snubber network?
The caps I have look like little white plastic blocks with 2 pins out of the bottom. I can post a pic if that helps.

Thanks a lot guys, it's greatly appreciated.

Ron
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Old 23rd July 2009, 09:07 PM   #17
grenert is offline grenert  United States
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Quote:
Originally posted by Renron
Are you saying that because the capacitance is so small , .068uF that it would be OK to use electrolytics as the caps in a snubber network?
The caps I have look like little white plastic blocks with 2 pins out of the bottom. I can post a pic if that helps.
No, I'm saying that at such low capacitances, electrolytics are not needed, desirable, or even available. Your description of a "plastic block" sounds like a film capacitor, which should be fine. Film capacitors are nonpolar, hence no need to mark + and - on the board.
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Old 23rd July 2009, 09:27 PM   #18
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Old 23rd July 2009, 09:30 PM   #19
Renron is offline Renron  United States
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Grenert,
Thank you for taking the time to answer my (probably) foolish question. I know from hanging around this website long enough that even though some of us (me) ask to be spoon-fed information, it is better for us to figure it out on our own.
I too think what I have in my surplus bag of stuff, is a film cap.
Thanks.

I found some other stuff too, a 100V poly cap from Panasonic which, after I looked up the specs. led me to a table of "Permissible Voltage (RMS) in Alternating Current Corresponding to DC Rated Voltage". This particular unit I have is rated for 63V RMS Alternating Current. Happy camper having learned quite a bit today on power supplies and how complicated they can be. I had no idea capacitors other than nonpolarized could be used safely in SOME A/C applications.

Thank you both VERY much.
Appreciative,
Ron
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Old 23rd July 2009, 10:26 PM   #20
Renron is offline Renron  United States
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As long as I am pickin' yer brains......
What does the P mean?
I presume this is a film cap. yes?

Thanks Ron
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