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Old 21st January 2007, 12:46 AM   #1251
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HI

Next week I would like to power up my Aleph X amplifier using Kristijan pc boards.
Would you please some one let me know if I have to use heat sink on the driver mosfet (IRFP9610). If yes what size must be . I plan to use TO220 heat sink on each IRFP9610 but I'm not sure if that will be OK .
Any advise before I power up the amp I would greatly appreciate it .
Today I just finished my first Aleph amp .I really like it . Aleph 30 using pc board design by Peter Daniel .I would like to say a big thank to Mr.Pass for such a great amp .
Thank you very much to all .


Regards
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Old 21st January 2007, 12:54 AM   #1252
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Quote:
Originally posted by gaborbela
HI

Next week I would like to power up my Aleph X amplifier using Kristijan pc boards.
Would you please some one let me know if I have to use heat sink on the driver mosfet (IRFP9610). If yes what size must be . I plan to use TO220 heat sink on each IRFP9610 but I'm not sure if that will be OK .
Any advise before I power up the amp I would greatly appreciate it .
Today I just finished my first Aleph amp .I really like it . Aleph 30 using pc board design by Peter Daniel .I would like to say a big thank to Mr.Pass for such a great amp .
Thank you very much to all .


Regards

if that X is mirrored Aleph 30 (with different voltages and currents) mosfets in input LTP will be just warm ;
give link to his exact schmtc,so we can check ;
anyway-if that is not already prepared,put them on small heatsink together; not to cool them,but to keep them on same temp
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Old 21st January 2007, 01:11 PM   #1253
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HI
Thanks for the answer , these would be the high power verizon Aleph X or some people call it industrial verizon . Supplied from 2x18V AC 1.5K VA transformer which would be around 22V DC .
Only difference between these and Grey Rollins design these one use 8 power mosfet per channel not 12. Everything else is the same .
You can see the the schematic and more information on his website .
www.kk-pcb.com
Thanks one more time for the help .


Regards
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Old 21st January 2007, 01:25 PM   #1254
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by gaborbela
HI
Thanks for the answer , these would be the high power verizon Aleph X or some people call it industrial verizon . Supplied from 2x18V AC 1.5K VA transformer which would be around 22V DC .
Only difference between these and Grey Rollins design these one use 8 power mosfet per channel not 12. Everything else is the same .
You can see the the schematic and more information on his website .
www.kk-pcb.com
Thanks one more time for the help .


Regards
they will have same dissipation as in your A30.

just put them on same piece of tin or small heatsink ,from before mentioned reasons.
same applicable for your A30
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Old 29th January 2007, 10:58 AM   #1255
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Hi,
I am looking for a set of v.1.0 schematic by Hifizen boards if anyone has some spare and would like to sell them.
Thanks
Greg
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Old 29th January 2007, 11:25 AM   #1256
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Quote:
Originally posted by PixelPlay
Hi,
I am looking for a set of v.1.0 schematic by Hifizen boards if anyone has some spare and would like to sell them.
Thanks
Greg
Greg,

Have a look here:

http://www.diyaudio.com/forums/showt...35#post1093335

Cheers,
Dennis
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Old 29th January 2007, 08:07 PM   #1257
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Location: austria, kottingbrunn
Hi!

Is it a good idea to use the aleph-x with increased ac current gain (e.g.: 75%) for frequencies below 300Hz in an active speaker system?

For example:
+-25V rails
5A Bias
->200W@4ohm (according Williams spreadsheet)
Dissipation will be only 270W!


Robert
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Old 29th January 2007, 10:44 PM   #1258
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You can try it. The result is usually less distortion at the lower
power levels, but more distortion as the current source starts
to go into cutoff on the negative swing. If you increase the
idle bias you can get rid of that as well.

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Old 29th January 2007, 11:32 PM   #1259
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HI
Please help with my AX .
Today I power up the Aleph X amplifier for a few second but I afraid to leave the power on because it goes up right away over 7A .
I connected one tester between the board (using Kristijan type of boards) and the power supply on the positive .
All 3 trim pots were adjusted on the highest value before I powered up .
Unfortunately it draw over 7A and the thermistor burning .
I know many people use the same boards like mine , would you please help .
Unfortunately I don't have variac to power it up slowly .
Thanks for the help..
Regards
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Old 30th January 2007, 01:50 AM   #1260
Nixie is offline Nixie  Canada
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Can you post a scan or good photo of your completed board so we can check for any soldering or placement errors? Probably that's not the case, but might as well eliminate the possibility.
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