Aleph4 capacitor selection

Jmertz · 1st February 2002, 04:57 AM

Hello everyone,

Trying to decide which caps to use for the 220uF ones in the Aleph4. Can anyone recommend a readily available component? I can find some made by Nichicon, but am not sure about the sonic differences among capacitors. Also, I noticed the DC blocking capacitor in the feedback loop. (used to decrease DC offset) In the Aleph4 schematic it shows the positve terminal going to ground through a 10K resistor. Is this correct? Is the AC signal present here OK on a polarized cap? Or is the cap a bipolar part?? It seems to me that the cap will see a negative voltage (due to the AC waveform) across it.

Peace

Jake

Nelson Pass · 1st February 2002, 09:16 PM

The high frequency Panasonics from Digikey work
fine.

R. McAnally · 2nd February 2002, 12:08 AM

The capacitor is like a "dead short" at audio frequency signals. It will not see a reverse bias because it has effectively zero AC across it. It is connected as it is because the DC voltage present at the (-) side is less than ground potential - that makes ground "more positive".... and hence the + going to ground.

Hope this helps,

Quote:

Originally posted by Jmertz
Hello everyone,

Trying to decide which caps to use for the 220uF ones in the Aleph4. Can anyone recommend a readily available component? I can find some made by Nichicon, but am not sure about the sonic differences among capacitors. Also, I noticed the DC blocking capacitor in the feedback loop. (used to decrease DC offset) In the Aleph4 schematic it shows the positve terminal going to ground through a 10K resistor. Is this correct? Is the AC signal present here OK on a polarized cap? Or is the cap a bipolar part?? It seems to me that the cap will see a negative voltage (due to the AC waveform) across it.

Peace

Jake

wuffwaff · 3rd May 2002, 06:48 PM

Hi,

I´m currently finishing my Aleph5 (at last) and I´m not shure about the minimum voltage for C9. I would like to use 25V rated Panasonics for all the 220mu positions and I´m using a 32-33volt supply.
Looking at the voltages I think there should be about 12-13volts over C9. Is this right or am I overlooking something?

william

1st February 2002, 04:57 AM	#1
Jmertz diyAudio Member Join Date: Jan 2002 Location: Philadelphia	Aleph4 capacitor selection Hello everyone, Trying to decide which caps to use for the 220uF ones in the Aleph4. Can anyone recommend a readily available component? I can find some made by Nichicon, but am not sure about the sonic differences among capacitors. Also, I noticed the DC blocking capacitor in the feedback loop. (used to decrease DC offset) In the Aleph4 schematic it shows the positve terminal going to ground through a 10K resistor. Is this correct? Is the AC signal present here OK on a polarized cap? Or is the cap a bipolar part?? It seems to me that the cap will see a negative voltage (due to the AC waveform) across it. Peace Jake __________________ audio4life

3rd May 2002, 06:48 PM	#4
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	capacitor voltage Hi, I´m currently finishing my Aleph5 (at last) and I´m not shure about the minimum voltage for C9. I would like to use 25V rated Panasonics for all the 220mu positions and I´m using a 32-33volt supply. Looking at the voltages I think there should be about 12-13volts over C9. Is this right or am I overlooking something? william

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1st February 2002, 09:16 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	The high frequency Panasonics from Digikey work fine.

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