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Old 20th May 2007, 07:56 PM   #1
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Default Warm capacitors.

When powering up my Aleph-x at about 5V (normal is 24 V) two electrolytes are getting warmer then six of the rest. About 29 C instead of 24 C. Is this something to worry about?
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Old 20th May 2007, 07:59 PM   #2
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are this two in same position in circuit as rest of them?
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Old 20th May 2007, 08:00 PM   #3
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Yes, maybe.
If the ambient temperature is 24į, and the rail voltage is only 5V, I would presume something is wrong. Is the amp newly build or not?

/Hugo
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Old 20th May 2007, 08:08 PM   #4
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Zen Mod

Yes they are.

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Yes it is. This is the first test. Slowly, slowly Iím raising the voltage.
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Old 20th May 2007, 08:17 PM   #5
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Don't raise the voltage.
5V is plenty and don't leave it on too long if the caps get warm.
Measure if your polarity is correct; confirm you got a positive voltage on the positive side of the cap and negative on the negative side.
That would of course be DC. Tell us if you measure AC voltage over the caps as well and how much.
In any case: don't raise that voltage for now.

/Hugo
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Old 20th May 2007, 08:20 PM   #6
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That will I certainly do, tomorrow.

Powering it up again. Now it has disappeared. Strange. Iíll be back tomorrow with further reports.

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Do you measure this with or without connecting it to the power mains? (Maybe a stupid question but I'm asking it anyway to be sure).
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Old 21st May 2007, 06:20 AM   #7
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When you told us about the 5V, I assume there was mains voltage true a variac. I also assume the 5V was the rail voltage you measured somewhere after the rectifier. It is obviuos that you can not measure voltage without applying the mains.
Try to be specific as to what and where you measure voltages. Can you post a schematic of the power supply you used?

/Hugo
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Old 21st May 2007, 08:13 AM   #8
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Yes Iím using a variac. 5V was measured after the capacitors. between + and
ground and - and ground. Using two multimeters.
Hereís the schematic:

http://www.kk-pcb.com/power-x.html
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Old 21st May 2007, 08:34 AM   #9
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Well, keep the multimeters in place, slowly rise the voltage and keep an eye on the caps for heat.
It would be best to disconnect the power supply from the amp until you are sure both + and - voltages are fine.

/Hugo
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Old 21st May 2007, 07:42 PM   #10
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Using the Vac scale on the multimeter I couldnít find any AC.

But another thing happens. When turning down the variac after measuring voltage. The voltage quickly goes down to 0V. I don't think that is ok.
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