Has anybody built an Aleph-x to this spec??? - Page 6 - diyAudio
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Old 24th May 2004, 05:59 PM   #51
D3 is offline D3  England
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Default bleeding caps

Is it good practice to bleed the caps on switch off......what is the best state for caps to be in for longevity????

Will the Aleph-X circuit layout gradually allow a gentle discharge over time.......?????
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Old 25th May 2004, 01:39 AM   #52
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Let's not forget, this is class A and I'll bleed any amount of caps down to about 6 volts in 2 seconds. You may want to throw a 1K power resister to suck the last 6 volts over time, but the bulk drains off rather quickly.
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Old 25th May 2004, 05:09 PM   #53
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Quote:
Originally posted by Brian Donaldson
Let's not forget, this is class A and I'll bleed any amount of caps down to about 6 volts in 2 seconds. You may want to throw a 1K power resister to suck the last 6 volts over time, but the bulk drains off rather quickly.
That's a good point.

BTW, I noticed that (at least in my A30), the plus and minus
rails drop off to different voltages. (One was a few volts
higher than the other, though I can't remember which one.)
I only bothered to measure it when I noticed that one
of the LED's stay on longer than the other one.

Dennis
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Old 26th May 2004, 05:44 AM   #54
wijgers is offline wijgers  Netherlands
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Default difference

I've the same with My Aleph 30. Difference in voltage of the caps after shut down.

I think that the caps at the Positive side were sightly higher than the negative caps.

Nils
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Old 26th May 2004, 09:04 PM   #55
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That difference is seen in the net current of the turn-off
thump.
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Old 15th June 2004, 06:40 PM   #56
Clarkcr is offline Clarkcr  United States
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Default 1000vdc Vs. 1500vdc

Why not use a bigger transformer. Don't beat me up too bad, just curious.


Chris
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Old 15th June 2004, 09:20 PM   #57
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I don't think this is a transformer issue, rather the existence
of a net DC value to the turn-off thump and any potential
asymmetry in the draw between + and - supplies by the
circuit.
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Old 16th June 2004, 06:31 AM   #58
D3 is offline D3  England
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Question Thump!

Hi, thanks Mr Pass for your comments.............are we talking here of a chance of getting ....... serious switch off/on thump...due to aysmitry......in discharge/charge. Or....is this likely to be a minor artifact?

Do large capacity caps make matters worse? .................

I guess it generally isn't an issue as.....I have not seen much in the way of discussion on this site........
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Old 16th June 2004, 06:08 PM   #59
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It's a minor issue. The thumps that I tolerate are on the
order of a volt or so, and I haven't seen that damage even
the most sensitive drivers I've played with.
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