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Old 6th February 2006, 09:04 PM   #101
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Quote:
Originally posted by PeterLeest
Hi Bruno,

I received the boards, very nice, thank you.

In post #65 attached circult, VR101 is 50K, however, I found in another link, the VR is 200 ohm. it could be to typo error.

http://www.kk-pcb.com/alephx.html

For the rectifier board, what is the value of R & C (example C1 & R1) ? Also, do you intend to use MUR30 (MUR3020WT) or MUR1560 for the Aleph-x ?

regards.
Hi all,

it's true, the value of VR101 is wrong, as it has been pointed out also in This Thread

Here's a copy of my answer to that:
"Hi all,

that is the schematic I posted on the Aleph-X PCB group buy thread.
It is directly taken from KK's Site and I've just redrawn it to create the PCB.
Now, the value of VR101 is wrong (my BIG mistake! ), it really must be 200 Ohms, as Grey pointed out. I apologise for this mistake.

As for R103, the value of 360 Ohms is exactly the same as on the original schematic I mentioned above. I do not know if it makes too much of a difference with Grey's original value of 330 Ohms.
With VR101 set to 0, the equivalent value of the parallel of R103 and R104 is 203.85 Ohms with R103=360 and 193.875 with R103=330 Ohms.
With VR101 set to 200 Ohms, the equivalent total resistance is respectively 255.53 and 249.1 Ohms.

I leave to the experts (I'm not one) to judge whether it's preferrable to set R103 to 330 Ohms or to leave it as it is. As far as I know, several Aleph-X have been already built following this schematic and they work..."


Here's the corrected schematic.

Cheers,

Bruno
Attached Files
File Type: pdf alephxcircuit.pdf (29.8 KB, 217 views)
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Old 6th February 2006, 09:43 PM   #102
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Default BOM for Main Board

Here's the BOM for the main board:
Attached Files
File Type: zip alephxv6bom.zip (2.6 KB, 154 views)
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Old 6th February 2006, 09:54 PM   #103
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Quote:
Originally posted by PeterLeest

For the rectifier board, what is the value of R & C (example C1 & R1) ? Also, do you intend to use MUR30 (MUR3020WT) or MUR1560 for the Aleph-x ?

regards.
Hi all,

the exact values of R & C on the rectifier boards depend on the diodes used, as well as on the transformer. A commonly used starting point is R=100 Ohm, C=100 nF.

Jim Hagerman (Hagtech) wrote a nice tutorial about "snubbers": Snubbers

As for the diodes, it depends on how much power you want to squeeze from your amp. For a low output power (20-30 W), MUR1560 will be enough, otherwise better use MUR3020WT or equivalent.

Cheers,

Bruno
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Old 6th February 2006, 10:16 PM   #104
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Hi all again,

today I ordered a new run of corrected rect. boards. They should be at my place in approx. 3 weeks.

Cheers,

Bruno
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Old 7th February 2006, 05:04 PM   #105
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Quote:
Originally posted by Carondimonio
Hi all again,

today I ordered a new run of corrected rect. boards. They should be at my place in approx. 3 weeks.

Cheers,

Bruno

Thx very much!, i have got my boards already, they are fantastic!, but i have a question, what is the value of the resitor on the FETS board.
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Old 7th February 2006, 08:46 PM   #106
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Hi lscangus,

the source resistors are calculated as follows:
R=0.5V/Bias current in each FET.

This is a nice tutorial.

And this spreadsheet will help you calculate all the important parameters of your Aleph-X.

Cheers,

Bruno

P.S.: Lately I've been very busy with professional and private matters, and I had to put aside my hobbies (including this one) a little bit. Please bear with me, I will try to answer all your questions as soon as I can, but please, do not get upset if I happen to disappear for a day or two every now and then...
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Old 8th February 2006, 05:18 PM   #107
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Default Late arriver ...

Hi carondimonio

I might be late but if I would be interested in a set of PCB's to build a stereo amp.

Thanks
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Old 9th February 2006, 07:09 AM   #108
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Quote:
Originally posted by Carondimonio
Hi lscangus,

the source resistors are calculated as follows:
R=0.5V/Bias current in each FET.

This is a nice tutorial.

And this spreadsheet will help you calculate all the important parameters of your Aleph-X.

Cheers,

Bruno

P.S.: Lately I've been very busy with professional and private matters, and I had to put aside my hobbies (including this one) a little bit. Please bear with me, I will try to answer all your questions as soon as I can, but please, do not get upset if I happen to disappear for a day or two every now and then...


What do you mean by 0.5V/bias current?

Angus
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Old 10th February 2006, 03:14 AM   #109
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it means the r value = .5 divided by the bias current at each fet. also look here
http://www.diyaudio.com/wiki/index.php?page=Aleph-X

All the information you need should be linked to here.

-eric
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Old 11th February 2006, 08:53 AM   #110
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Jpnitrof,
did you get my mail?
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