problem with PASS AM.

xr000 · 16th March 2006, 03:47 AM

THE RED SQUARE,two figure are printed wrong,
at the begging ,the am worked well,
and after a long time ,the am didn't work.
and when i put two conponent in correct position,but,the IRFP 240 current get very big,5A,
why did this happen?

xr000 · 16th March 2006, 03:48 AM

sch.

GRollins · 16th March 2006, 04:09 AM

Aleph-M?
Seems to me that circuit once had another name....oh well, you can't have everything.
If you're getting 5A, chances are good that the voltage across the 390 Ohm load to the front end is too high. That would drive the output MOSFET (the one on the bottom) into some pretty serious conduction.
You'll need to check the rest of the components. It wouldn't surprise me if one of the front end MOSFETs is roasted.

Grey

lumanauw · 16th March 2006, 10:08 AM

Hi, Xr000,

You buy the PCB from where? Is Mr. Nelson Pass know about this? He's the owner of all Aleph design.

xr000 · 17th March 2006, 03:30 AM

I get the SCH from web.
and the board were produced myself!.

GRollins · 17th March 2006, 01:33 PM

If you get curious about the history of that design, you might look up a thread here called "The Mini-A"

Grey

xr000 · 18th March 2006, 02:55 AM

ok,he he ,thank you again.

xr000 · 18th March 2006, 03:23 AM

Quote:

Originally posted by xr000
ok,he he ,thank you again.

xr000 · 18th March 2006, 03:24 AM

Quote:

Originally posted by xr000

China_Vincent · 18th March 2006, 11:23 AM

Very beautiful!
Support!!!!

17th March 2006, 03:30 AM	#5
xr000 diyAudio Member Join Date: Jan 2005 Location: qingdao	thanks GRollins I get the SCH from web. and the board were produced myself!.

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16th March 2006, 04:09 AM	#3
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Aleph-M? Seems to me that circuit once had another name....oh well, you can't have everything. If you're getting 5A, chances are good that the voltage across the 390 Ohm load to the front end is too high. That would drive the output MOSFET (the one on the bottom) into some pretty serious conduction. You'll need to check the rest of the components. It wouldn't surprise me if one of the front end MOSFETs is roasted. Grey

16th March 2006, 10:08 AM	#4
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, Xr000, You buy the PCB from where? Is Mr. Nelson Pass know about this? He's the owner of all Aleph design.

17th March 2006, 01:33 PM	#6
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	If you get curious about the history of that design, you might look up a thread here called "The Mini-A" Grey

18th March 2006, 02:55 AM	#7
xr000 diyAudio Member Join Date: Jan 2005 Location: qingdao	ok,he he ,thank you again.

18th March 2006, 11:23 AM	#10
China_Vincent diyAudio Member Join Date: Dec 2005 Location: Auckland, New Zealand	Very beautiful! Support!!!!