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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th April 2012, 07:25 PM   #3621
Julf is offline Julf  Europe
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Originally Posted by Sam Lord View Post
I don't get what's happening (= I forgot ), is the danger that he would exceed the voltage limits for his input stage, so he has dropped his rail voltage to provide it directly? Zeners with a cap bypass would surely work, but I understand Erlend wanting to find the cleanest possible source. He could use a IC regulator or precision voltage source...if there were room for that...But if the voltage simply feeds regulators like the HxRs, which have an incredibly high PSRR, your zener/cap suggestion would be as clean as anybody could want.
Yes, I am assuming there is some sort of regulation on the nc400, but the specs don't cite any rejection ratio for the input stage, so can't verify...

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Also wondering about your resistor woes...obviously you measured for shorts and opens both within and near the resistor afterwards.
Well, I removed the resistor - so there *should* be an open - but as I don't have a circuit diagram, it is hard to know what and where to measure.

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I've had stray fibers of copper do a job on a circuit, then disappear with a good shake or compressed air. Do you think a semiconductor was blown from the incident? When I see a total collapse with no visible damage, that's what I suspect next.
It is of course possible that some temporary short has damaged something, but I still suspect thermal damage to the intermediate layers of the PCB - it seems to be at least a 4-layer one.
 
Old 12th April 2012, 02:57 AM   #3622
mr_push_pull is offline mr_push_pull  Europe
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is misspelling "scope" as "scoop" some kind of fashion lately?
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Old 12th April 2012, 03:46 AM   #3623
Sam Lord is offline Sam Lord  United States
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At least "scoop" in Dutch sounds like the English "scope."
 
Old 12th April 2012, 04:41 AM   #3624
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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At least "scoop" in Dutch sounds like the English "scope."
Thank you for the hint !
 
Old 12th April 2012, 06:13 AM   #3625
Julf is offline Julf  Europe
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Originally Posted by mr_push_pull View Post
is misspelling "scope" as "scoop" some kind of fashion lately?
Get your sin!
 
Old 12th April 2012, 08:20 AM   #3626
ChrisPa is offline ChrisPa  United Kingdom
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Originally Posted by mr_push_pull View Post
is misspelling "scope" as "scoop" some kind of fashion lately?
I had no problem with 'scoop'

Made perfect sense to me, and so consistent among so many posters
 
Old 12th April 2012, 08:27 AM   #3627
StigErik is offline StigErik  Norway
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You mean "Oscilloscope" ?
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Old 12th April 2012, 08:32 AM   #3628
StigErik is offline StigErik  Norway
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This is my "scoope":

Click the image to open in full size.

Tektronix model 310, about 60 years old.
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Old 12th April 2012, 08:37 AM   #3629
Mark.Clappers is offline Mark.Clappers  Netherlands
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I am just happy this forum is not in German, that would be far worse for most Dutch
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Old 12th April 2012, 08:43 AM   #3630
Julf is offline Julf  Europe
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Tektronix model 310, about 60 years old.
Cool! My first one was a Radio Shack one, probably roughly same age as yours.
 

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