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wanted :100W Aleph X (kari's board) bom/parts list
wanted :100W Aleph X (kari's board) bom/parts list
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Old 7th July 2005, 12:59 PM   #21
dhole is offline dhole  United Kingdom
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Kari

In your parts list what are values of the resistors on the output boards of r1-3 and r4-6 please.

dave
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Old 7th July 2005, 02:52 PM   #22
Eric is offline Eric  United States
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wanted :100W Aleph X (kari's board) bom/parts list
Dave,

Click on the tabs across the bottom of the spreadsheet. There are 4 tabs there...

Eric
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Old 7th July 2005, 03:13 PM   #23
dhole is offline dhole  United Kingdom
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Thanks Eric. I am using Open office so things are a litle different, i missed the tabs.

I think I will stick with Kari's onboard part list. It is generally the same .... I am concerned about a lack of diodes around the power input. There seems to only be oine diode on the board.

This projest is obviously more of a task than the Aleph 5s I ve just built. But Hopefully all will be ok. My concer at the moment is that I hope my fet matching is up to scratch. I matched the diff pair to 0.01vgs..... hope this is enough.

The next would be the tuning up at startup. I havent measured the dc offset etc on my aleph 5s so I guess I could start there....
I will have top read up on that... I dont have a scope though, not even sure if I need it for that......
best get reading....

thanks again everyone for your advise... Im sure I will be back very soon.
dave
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Old 7th July 2005, 03:50 PM   #24
Assesears is offline Assesears  United Kingdom
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dhole
Quote:
The list states that r1-r3 on the utput board is 0.39
Yes your right mate should be 0.39R 3W(rs no. 294-2855) not 39R(rs no.152-381), using the schematic below from

http://web.vip.hr/pcb-design.vip/alephx.html
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Old 8th July 2005, 10:50 AM   #25
dhole is offline dhole  United Kingdom
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Has anyone out there finished An AX using Kari's boards ? I would be interested to see some pics and hear any comments on construction specs etc......

dave
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Old 11th July 2005, 10:35 AM   #26
dr.strangelove3 is offline dr.strangelove3  Netherlands
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I have a pair of Kari's boards and I'm gathering parts. I am very interested in what resitors (brands) are used by others. Which resistors are most important for sound quality. And for which can I use cheap ones.
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Old 12th July 2005, 02:42 PM   #27
Eric is offline Eric  United States
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wanted :100W Aleph X (kari's board) bom/parts list
I'm using Vishay/Dale 1% 1/4w metal film resistors from Mouser for all of my Aleph-Xs that are currently in progress. I ordered a number of each value and am carefully matching values across each side of the amp. There is a surpirsing amount of variability in the measured valued, so it is clearly a worth while effort.

For the a40 amp that I build a few years ago, I exclusively used Shinkoh Tantalum 1% 1/2w resistors and they all measured exactly spot on values - but they cost nearly $5 each (the Vishay/Dales are only $0.20 each).
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Old 12th July 2005, 05:04 PM   #28
dhole is offline dhole  United Kingdom
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does Nelson Matrch his resistors ?..
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Old 12th July 2005, 06:33 PM   #29
Eric is offline Eric  United States
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wanted :100W Aleph X (kari's board) bom/parts list
I don't recall reading anything that he posted about matching resistors. The Aleph-X that has developed here seems to be very sensitive to component selection - if things are not matched carefully, DC offset is a likely outcome. I have carefully matched resistors and mosfets on each side of the amp. Don't know the result yet, haven't built my power supply.

Nelson probably has a more elegant solution...
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Old 12th July 2005, 07:27 PM   #30
dhole is offline dhole  United Kingdom
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Eric

Are you using Kari's boards ?
dave
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