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Old 8th January 2015, 08:59 PM   #1
Zoef is offline Zoef  Netherlands
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Default Aleph 3? Project.

Received some pcb's today from ebay. Aleph 3 is printed on it.
The pcb's have a goldplated copper thickness of 75um (pcb is 2mm)

My question is, is it a aleph 3? And is it any good in this form?
And, are there mods is can do directly.

Posted a picture of the pcb and the parts list and schematic that came with it.
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Old 8th January 2015, 09:07 PM   #2
Zoef is offline Zoef  Netherlands
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Schematic shows some other parts than the parts list.
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Old 8th January 2015, 09:13 PM   #3
Zen Mod is offline Zen Mod  Serbia
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KK schematic , chinese pcb
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Old 8th January 2015, 09:46 PM   #4
Zoef is offline Zoef  Netherlands
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Other words, not so good?
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Old 8th January 2015, 09:59 PM   #5
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I hope you appreciate that all the MOS-FETs need to be matched. Not to each other but in pairs for the Aleph 3.
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Old 8th January 2015, 10:04 PM   #6
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Here is the Pass Aleph 3 Service Manual...

http://peufeu.free.fr/audio/schemas/Pass_Aleph_3.pdf

The PCB layout is not that critical, unfortunately the Orientals often go for an aesthetically pleasing PCB layout design rather than one that is optimum for performance.
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Old 8th January 2015, 10:08 PM   #7
Zoef is offline Zoef  Netherlands
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Thanks! I need to match the irf's you said? In pairs? So not matching 4?
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Old 8th January 2015, 10:11 PM   #8
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No, the top two are one pair and the bottom two are another.

The two pairs can be different.

This is only to ensure that each one of the pair shares the load current with its pair.

When my Aleph 4 was built it took over 50 MOS-FETs to get the 4 x 6 matched sextets.

Last edited by KatieandDad; 8th January 2015 at 10:16 PM.
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Old 8th January 2015, 10:11 PM   #9
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Quote:
Originally Posted by Zoef View Post
Other words, not so good?
Nothing wrong with Chinese boards, although I like to use U.S. sources
(costs a little more) and spec heavy copper. (heavy copper for obvious
high current, but mostly easier to re-solder when replacing components)

Nothing wrong with KK's schematic, although it is not identical to original.

I will post a thread on the latest thinking about this circuit in a day or less.

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Old 8th January 2015, 10:12 PM   #10
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by Zoef View Post
Other words, not so good?
I didn't said that , just clarified what's what

however , search around and I believe you'll find appropriate schematic/nomenclature of parts
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