Aleph P1.7 Coupling Cap - diyAudio
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Old 19th April 2008, 10:09 PM   #1
Bengali is offline Bengali  United States
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Default Aleph P1.7 Coupling Cap

Hi,

Is is okay to use polarized caps for the 10uFx3 coupling caps?

Which side should the + go to?

What is the minimum voltage rating for the cap?
35V will suffice?

Thanks
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Old 20th April 2008, 06:49 PM   #2
Peppe is offline Peppe  Italy
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Default Re: Aleph P1.7 Coupling Cap

Quote:
Originally posted by Bengali
Which side should the + go to?
Hi,
hope this helps:

http://www.diyaudio.com/forums/showt...74#post1486174

cheers
Peppe
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Old 20th April 2008, 07:19 PM   #3
Bengali is offline Bengali  United States
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Hi Pepe,

thanks. I just checked original P1.7 schematic from the pass service manual. It does show polarity in that schematic.

it has + going to Q15 D, + going to Q16 S.
- to Q18 D, + to Q19 S.

should I follow the schematic or the posting?

per your previous post do you still measure over 50V across the caps?

thanks.
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Old 20th April 2008, 07:52 PM   #4
Peppe is offline Peppe  Italy
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Hi Bengali,

actually I mounted the caps as in the attached image.
The polarity of all caps are like you reported except that one in the circle...

As You read in the other post my measures are quite strange: 50 Volt is too much! I won't be at home before ten days. I will make other measuraments trying other position of the caps.

ASAP I will post there my results....

cheers
Peppe
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Old 20th April 2008, 08:06 PM   #5
Bengali is offline Bengali  United States
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Hi Peppe,

yes, that's the one I was not sure of.

so Q18 should tie to pos side of cap and not neg. side?

thx.
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Old 20th April 2008, 08:41 PM   #6
KSTR is offline KSTR  Germany
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Quote:
Originally posted by Bengali
Hi Peppe,

yes, that's the one I was not sure of.

so Q18 should tie to pos side of cap and not neg. side?

thx.
Yes, the original manual is "wrong", but for film caps the choosen pol-cap symbol didn't matter. Blame it on the Schematic software, this "problem" is quite common with these (no true non-pol cap symbol, with two straight plates), you will find pol-cap symbols in many schematics where in fact non-pols are installed.

- Klaus
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