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Old 17th March 2007, 08:36 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Default BYW80-200 for rectifier?

Hi all,

I found some BYW80-200 (ST) and i want to use them for my GCs rectifier. Its too hard to find MUR8x0 series in Turkey. As i examined BYWs datasheet, the specs are very like to MUR diodes.
Does anybody use that rectifiers? May i use them instead of MUR?
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Old 17th March 2007, 08:45 AM   #2
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I can see no reason why it wouldn't work.
Just give it a try.

/Hugo
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Old 18th March 2007, 01:06 PM   #3
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Yea i think the same way. But i want to be sure, any DIYer tried it or not?
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Old 18th March 2007, 01:43 PM   #4
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Quote:
Originally posted by Dxvideo
Yea i think the same way. But i want to be sure, any DIYer tried it or not?
Hi,
I have used them in my amplifier power supply (500VA, 88,000uF) so they will be more than adequate for a gainclone I think. I was recommended the MUR but they were too expensive so I used the BYW80-200 from Ebay. I got the idea from this page: http://www.hificollective.co.uk/components/diodes.html

I used parallel pairs at first but found that to be completely unnecessary. I used some small clip on heatsinks. 35nS is very fast. I cannot honestly comment on the 'sound' of these diodes because I also increased and updated the capacitance at the same time. But my amplifier now sounds better than ever!

Picture taken before removing parallel diodes:
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File Type: jpg cyrus psx - recapped - new diodes.jpg (94.2 KB, 206 views)
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Old 18th March 2007, 04:05 PM   #5
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Hmm.
Should i use them with heatsinks?
I will use them under 40VAC and will sink 3A per rail max.
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Old 18th March 2007, 10:42 PM   #6
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Quote:
Originally posted by Dxvideo
Hmm.
Should i use them with heatsinks?
I will use them under 40VAC and will sink 3A per rail max.
I'm not exactly sure if they would be necessary, but, why take the risk when clip-on TO-220 heatsinks are so cheap?

One of my worries was the large currents that flow when first switching the amp on and charging the capacitors. I use 88,000uF so I use large diodes with heatsinks just to be very safe.
I don't like to take risks with power supplies but I may be trying too hard!!

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Martin.
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Old 19th March 2007, 01:01 PM   #7
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Why not?
I can use the small heatsinks for 78XX series. But my snubbers are too small if compares to yours. I use only 4x4,700 on each rail! And 2,200's on amp board..
Does that cause any hum?
And another question; should i put parallel hundreds nF caps to diodes? Because i saw this application on many GC psus.. In fact i dont know the reason..
Thanks.
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Old 19th March 2007, 01:11 PM   #8
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You can get away without heatsinks, but unless you are stuck for space it would be better to use them.
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Old 19th March 2007, 01:39 PM   #9
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Quote:
Originally posted by Dxvideo
Why not?
I can use the small heatsinks for 78XX series. But my snubbers are too small if compares to yours. I use only 4x4,700 on each rail! And 2,200's on amp board..
Does that cause any hum?
And another question; should i put parallel hundreds nF caps to diodes? Because i saw this application on many GC psus.. In fact i dont know the reason..
Thanks.
I ask again: Why not use small and very cheap heatsinks?

The size of your capacitors are a personal choice. Some people believe less is better with gainclones. I think that, for amplifiers in general, more is better for low frequencies. I do not own a gainclone though so what do I know?

I believe the 100nF caps (on the diodes) help to suppress any high frequency switching noise. You can probably see from my picture that I now have spaces for these since removing the parallelled diodes. I will definitely be trying it very soon!! I'll let you know if I hear a difference.
You should try it too!! It is cheap, quite safe, and can be removed easily. This is what DIY is all about!!

Good luck,
Martin.
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Old 19th March 2007, 03:25 PM   #10
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So I will connect my diodes to small heatsinks.. Thats ok.
I asked you 100nF caps in parallel because i have some worries that if I put 100nFs in parallel then they causes any reverse current leakage on rectifiying line. But I am not sure on that! Thats only a foreboding.
Thanks again.
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