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F6 Illustrated Build Guide
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Old 12th March 2018, 10:38 PM   #1091
KevinHeem is offline KevinHeem  United States
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F6 Illustrated Build Guide
Quote:
Originally Posted by silasmellor View Post
...snubbers for the rectifiers?
I think your headed down this path:

QUASIMODO TEST JIG
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Old 12th March 2018, 11:29 PM   #1092
2 picoDumbs is offline 2 picoDumbs  Australia
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Papa gave me some advice on it.
I will need to check what he wrote.
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Old 12th March 2018, 11:54 PM   #1093
silasmellor is offline silasmellor  Denmark
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Thanks, that would be helpful as I don't yet Penang oscilloscope.
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Old 13th March 2018, 12:37 AM   #1094
2 picoDumbs is offline 2 picoDumbs  Australia
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Try a 3W 10 Ohm resistor in series with a 47nF capacitor.
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Old 13th March 2018, 09:02 AM   #1095
silasmellor is offline silasmellor  Denmark
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Thanks will try that. Any particular cap? I seem to recall something about ceramic being preferred for snubbers. Across each diode or across secondaries?
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Old 13th March 2018, 09:56 AM   #1096
2 picoDumbs is offline 2 picoDumbs  Australia
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I think Papa uses ceramic.
I asked the same question. Papa said try it both ways, but obviously simpler just across the secondaries.
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Old 13th March 2018, 10:05 AM   #1097
silasmellor is offline silasmellor  Denmark
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Ok, I will try it and report back. Thanks again.
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Old 17th March 2018, 10:32 PM   #1098
silasmellor is offline silasmellor  Denmark
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Ok tried the snubbers with 47nF+10ohm with and without additional 100 nF across secondaries. No difference. I guess im stuck at this point since i dont own an oscilloscope so really cannot do any measurements (math or no math) to find the right values.

Edit: just read through the quasimodo notes, and realized that according to Mr. Johnson, the Cs in the Cs+Rs should be larger than the parallel Cx - i will try and flip things around tomorrow and report back.
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Old 17th March 2018, 11:32 PM   #1099
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Let us know how it goes.
If there is no improvement you can always increase the amount of filtering in the powersupply.

Either way this is a fairly normal observation.
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Old 18th March 2018, 12:07 AM   #1100
wdecho is offline wdecho  United States
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From what I see the noise is 80db down from the fundamental which is plenty good enough in my world. The 120hz is a harmonic of the 60hz signal. Since you do sit with your ear next to your speaker I would not do anything. It will take more effort, time and money to improve on what you see on a graph that you cannot really hear from your listening position. Nothing actually to gain. Nice looking signal from the fundamental on with a touch of 2nd and 3rd harmonic. Should sound really good.
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