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Old 27th February 2019, 06:12 PM   #41
pinnocchio is offline pinnocchio  Canada
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Quote:
Originally Posted by tvicol View Post
Saligny will handle very high peak currents, far above your transformer capability. What you need to take in consideration is your trafo secondary that, for sure, will need to deliver serious current to keep these caps charged and as xrk971 mentioned, low ESR is not the right choice in class A operation.

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Tibi
In which case Kemet # ALS70A753KE040 would be better than Epcos/TDK # B41458B7689M000 ??

Thanks
Do
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Old 27th February 2019, 07:32 PM   #42
jan.didden is offline jan.didden  Europe
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3 x 68000 uF! What madness! Does anyone realise the spray of mains harmonics poured into the amp by the very high and spiky charge pulses for such crazy values??

Jan
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Old 27th February 2019, 08:45 PM   #43
pinnocchio is offline pinnocchio  Canada
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Originally Posted by jan.didden View Post
3 x 68000 uF! What madness! Does anyone realise the spray of mains harmonics poured into the amp by the very high and spiky charge pulses for such crazy values??

Jan
Jan,

I might not fully understand all that goes into the background when using such large values to filter, but I thought capacitors were there to filter/smooth the spikes?

What would then be your suggestion in CCRC for a Class A amplifier using this bridge proposed in this thread?

Do
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Old 28th February 2019, 06:08 AM   #44
jan.didden is offline jan.didden  Europe
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Insane cap values cause very high peak currents to charge in the short time when the diodes open around the peak of the secondary voltage. So you get high frequency high current circulating, which is hard to keep out of your amp even if the voltage on the cap looks 'nice'.

So yes, increasing the capacity smooths the voltage but worsens the other mentioned factors. There's no hard law but 3 x 68000uF is way overkill. 1/5th would avoid a lot of problems.

You should download PSUDII and play with it, very instructive.

Jan
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Old 28th February 2019, 04:04 PM   #45
ipolyakov is online now ipolyakov  United States
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Tibi,

What is a distance between the mounting pins of the bridge?

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Igor
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Old 28th February 2019, 04:20 PM   #46
tvicol is offline tvicol  Europe
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0,21inch = 5,3mm

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Tibi
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Old 28th February 2019, 04:50 PM   #47
ipolyakov is online now ipolyakov  United States
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Thanks!
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Old 28th February 2019, 07:40 PM   #48
Algar_emi is offline Algar_emi  Canada
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Old 28th February 2019, 10:18 PM   #49
jameshillj is offline jameshillj  Australia
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Do, there's a big difference between the 'sound' of the BHC ALS70A caps (now called Kemet) and the Epcos B41468 - the BHC produce a very enhanced midrange in any circuit I've tried them (including Denis Moorecroft's 'Slit Foils' and 'T-Network caps (now available by Supertec) in comparison to the overall even spectrum from the Epcos with a noticeably clean bass - these characteristics can be quite useful in your final design - unfortunately, both caps have quite a long 'breakin' period

… my 2 cents
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Old 1st March 2019, 08:08 AM   #50
tvicol is offline tvicol  Europe
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Last day is today !

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