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Old 29th September 2019, 05:32 PM   #2701
rysiu1267 is offline rysiu1267
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I want to build aleph x
Voltage 21 v dc 800W monoblock Transformer power per channel I already have.

using 4x irfp150 what bias current can I use and what power will I get?

Which company should I use irfp? Vishay will be good?

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Old 29th September 2019, 05:36 PM   #2702
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Aleph-X builder's thread.
clarify - what 800W?
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Old 29th September 2019, 05:41 PM   #2703
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Transformer power per channel I already have.
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Old 29th September 2019, 05:54 PM   #2704
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Aleph-X builder's thread.
clarify , what exact AC voltage (full specs - 2x ??Vac , or ??VacCT (center tapped))

even before that , say that 800VA is usually covering up to 250-300W of steady power consumption/dissipation

for that , you need much more outputs per channel , or your amp will be either current starved , or non-reliable

see Babelfish XJ , or JX …….. or whatever (Aleph X servo for Greedy Boyz) for more info
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Old 29th September 2019, 06:07 PM   #2705
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2x18V transformer ac voltage.

Instead of 8 x irfp240 I wanted to use 4x irfp150. Without exact pairing if possible.
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Old 29th September 2019, 06:19 PM   #2706
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Aleph-X builder's thread.
18Vac per rail will result in something as 22V5dc , loaded

say that you have 250W of dissipation per channel , 4 quadrants of outputs ........ that's 62W5 per quadrant , which calls for no less than 2 mosfets per quadrant , to keep dissipation per device in sane bracket

you must have matched all per quadrant , so matched pairs

though , it demand some thorough planning - what value of source resistors and few other details , to ensure that amp is stable dynamically and temperature-wise

now when you know numbers , try looking for example someone already built

Eric's web page about his Aleph X adventures is good place to start
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Old 4th October 2019, 02:20 AM   #2707
Eric is offline Eric  United States
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Aleph-X builder's thread.
Link is in my signature... Some of the images are a bit fuzzy, but all of the text is there for planning an Aleph-X amp. The nice thing about this design is you can easily customize it to suit your specific needs: optimize for 8 ohm load, optimize for 4 ohm load, adjust for specific power output figure.

An 800VA transformer can net you about 125w into either 4R or 8R loads. You'll need to have LOTS of heat sinking for each channel.
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Old 3rd December 2019, 01:29 PM   #2708
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Default PCBs

Any 100w AX pcbs left anywhere? I'd rather avoid having someone design them for me as I dont have the time.
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Old 3rd December 2019, 01:53 PM   #2709
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Aleph-X builder's thread.
There are many out there still! I bet you'll turn up a pair shortly...
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Old 3rd December 2019, 01:55 PM   #2710
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Originally Posted by Eric View Post
There are many out there still! I bet you'll turn up a pair shortly...
trouble is that one can only source the 40w version total 8 IRFPs per channel. I need the higher power version.
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