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Old 16th March 2006, 03:47 AM   #1
xr000 is offline xr000  China
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Default problem with PASS 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?
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Old 16th March 2006, 03:48 AM   #2
xr000 is offline xr000  China
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Default sch.

sch.
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Old 16th March 2006, 04:09 AM   #3
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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
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Old 16th March 2006, 10:08 AM   #4
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Hi, Xr000,

You buy the PCB from where? Is Mr. Nelson Pass know about this? He's the owner of all Aleph design.
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Old 17th March 2006, 03:30 AM   #5
xr000 is offline xr000  China
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Default thanks GRollins

I get the SCH from web.
and the board were produced myself!.
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Old 17th March 2006, 01:33 PM   #6
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If you get curious about the history of that design, you might look up a thread here called "The Mini-A"

Grey
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Old 18th March 2006, 02:55 AM   #7
xr000 is offline xr000  China
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ok,he he ,thank you again.
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Old 18th March 2006, 03:23 AM   #8
xr000 is offline xr000  China
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Quote:
Originally posted by xr000
ok,he he ,thank you again.
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Old 18th March 2006, 03:24 AM   #9
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Quote:
Originally posted by xr000
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Old 18th March 2006, 11:23 AM   #10
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Very beautiful!
Support!!!!
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