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Old 20th May 2004, 11:49 PM   #11
moamps is offline moamps  Croatia
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Quote:
Originally posted by BlackDog
So anyway, are you referring to the blurry region at the peak and trough of the sinewave as the MHz oscillations???
Blurry region is ca 2MHz oscillation at 10kHz sinewave.
Quote:
If yes, then what are your timebase and sensitivity set to on the 'scope, and what frequency is your input signal??
10kHz input, ca 40Vpp level on the IC output, a crappy Technics speaker

Regards
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Old 20th May 2004, 11:53 PM   #12
jam is offline jam  United States
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http://ampchipdiy.com/phpBB2/viewtopic.php?t=224
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Old 20th May 2004, 11:59 PM   #13
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Quote:
Originally posted by jam
http://ampchipdiy.com/phpBB2/viewtopic.php?t=224
I wasn't looking for a definiton of Zobel

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Old 21st May 2004, 12:27 AM   #14
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Quote:
Originally posted by moamps


Blurry region is ca 2MHz oscillation at 10kHz sinewave.


10kHz input, ca 40Vpp level on the IC output, a crappy Technics speaker

Regards

Thanks Moamps,

I'll try and replicate with similar parameters.

SteveM
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Old 21st May 2004, 01:54 AM   #15
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"Zobel Network: A capacitor and resistor of specific values, placed in series across the loudspeaker terminals of an amplifier, to reduce oscillations which can cause instability and excessive heat-output from the chip."

From the http://ampchipdiy.com/phpBB2/viewtopic.php?t=224 link


"I wasn't looking for a definiton of Zobel"

Maybe you should ........... I think anyone with a basic understanding of
electronics should find enough information in the diyAudio Forums > Top > Amplifiers > Chip Amps > Do we need Zobel with chip amp thread to see how one works.

The only controversy on zoble networks seems to be your refusal to show the slightest interest in how they work in order to derive some criteria of when they are required and when they are not. Well maybe spliting the thread, for reasons that escape me, is controversial. I think everyone would be quite happy to discuss this in a new thread if desired. I would be happy to rehash to relevent points in this thread as well.
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Old 21st May 2004, 02:04 AM   #16
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Fred,

If I still was a moderator, I would ask you to stay on topic. Go back to your other favourite thread, if you have nothing (else related to the main subject) to say.

I didn't expect you'd be a game for GC boards

To make it clear for you, I'm looking for actual cases where Zobel was find useful, not theoretical. I don't know why this bothers you.
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Old 21st May 2004, 02:08 AM   #17
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Default On the other hand

Quote:
Originally posted by Peter Daniel
It would be also interesting to know what circuit, and how implemented, they use. I had also problems with instability, but it was fixed after changing grounds layout.
Why is it such a stretch that problems of instability should respond to the correct application of a Zobel network then? I am really confused with where you are going with this........ Are you trying to concede gradually or is this latest information supposed to support your position? Hasn't this been beat into the ground enough at this point? We really don't want to cut into your amp building time over an 'agree to disagree' type issue.
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Old 21st May 2004, 02:12 AM   #18
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Fred,

I'm already tired of your "brilliant" persistance. I'll do some search on my part. This is a first thread I found. I know there is much more, similar: http://www.diyaudio.com/forums/showt...ht=#post382347
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Old 21st May 2004, 02:22 AM   #19
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Fred,

If you want to play the game, I'm looking for posts like #23 in this thread: http://www.diyaudio.com/forums/showt...bel#post387284

But again, the guy had 10,000U caps way off the chip, and no caps at the chip, so his setup might have beeen compromised.
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Old 21st May 2004, 02:28 AM   #20
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#2279 in this http://www.diyaudio.com/forums/showt...ht=#post379186

But again, home made triple Cat cables. BTW, this amp performed splendidly in my setup, was built the same as all the other. First complain from field customer, probably the first customer with home made Cat 5 speaker cables
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