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Chip Amps Amplifiers based on integrated circuits

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Old 29th June 2013, 10:55 PM   #11
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yup that's better.

but putting it on the underside of the MF decoupling caps will work too as they are not that far from the chip's pins.

Last edited by jlester87; 29th June 2013 at 11:05 PM.
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Old 29th June 2013, 11:51 PM   #12
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You also overlooked that there's already a capacitor dedicated to absorb high freq noise near to the chip's pin. (In the PCB)
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Old 30th June 2013, 08:20 AM   #13
AndrewT is offline AndrewT  Scotland
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The rail to rail cap is NOT what National tell you to do.
The MF decoupling is far too far away to be considered for HF decoupling.
Locating the HF decoupling on the MF decoupling pins leads to ringing.
I have already told you this.

This is my last attempt to get the message through to you !
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Old 30th June 2013, 09:03 AM   #14
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How about one more time.

Hey Andrew where's that great post you made about the point to point chipamp and it's HF and MF decoupling?

(two 100nf, 50V X7R cut short on one side and attached to chip pins, other sides connected very close. Now take this one HF ground point and connect it to the MF ground point of your mid size caps... )

That was very clear.

(A drawing / picture would be even better!)

Often it is a simple mismatch between language and/or knowledge of the parties that leads to misunderstanding.


Last edited by AudioLapDance; 30th June 2013 at 09:05 AM.
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Old 30th June 2013, 09:56 AM   #15
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Yes, Andrew always had great posts about something but he seems to lack courtesy.

Ok I hope that the suggestions are quite great improvement on the measurements.

Anyway here's the latest layout containing the changes. I appreciated your suggestions guys.
Attached Images
File Type: png 3886 new.PNG (67.7 KB, 386 views)
Attached Files
File Type: pdf MyRefC-Jlester-Bottom (1.965 x 2.625).pdf (17.2 KB, 40 views)
File Type: pdf MyRefC-Jlester-Overlay.pdf (22.3 KB, 39 views)
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Old 30th June 2013, 10:54 AM   #16
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He seems to lack courtesy because he gets burnt out.

You're asking good questions but unfortunately there is an enormous amount of misinformation out there.

He gets burnt out more quickly when he sees exchanges in a 'confrontation' mode rather than a 'needs a clearer explanation' mode.

Speaking of clarity,

1 .jpeg = 1k ASCII



I think Andrew is trying to suggest something like this:

HF to MF decouple 3886.PNG

PS Andrew, if you could show rather than describe, your suggestions would be crystal clear. Are you comfortable with any quick 'drawing' software, my hack-job was just done in MS Paint (brush, draw polygon, fill, ...)?

PPS Andrew, did you get my email a few months ago about working on a "setting up a proper chipamp" thread?

Last edited by AudioLapDance; 30th June 2013 at 11:03 AM.
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Old 30th June 2013, 11:46 AM   #17
AndrewT is offline AndrewT  Scotland
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Software takes me forever to learn.
Then using that software is 100times slower than sketching by hand.
I do not want to waste all my time on the PC, I spend too long re-answering the questions that keep getting repeated. Even from the same Member in the same Thread !!!!

That = burn out.

I can't recall an Email.
What is your Email name (not the full address) and rough date?
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Last edited by AndrewT; 30th June 2013 at 11:51 AM.
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Old 30th June 2013, 01:45 PM   #18
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Sorry if I made you burnt out. I just don't easily believe in information that others throw at me. Specially if there's no citing of source of information or if they haven't done a study or experiment about it. Anyway I know that your suggestion is the best and a basic guideline, but I am quite hesitant if it has an immediate impact on the actual performance. Nevertheless, I still changed the layout

Last edited by jlester87; 30th June 2013 at 01:54 PM.
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Old 30th June 2013, 02:22 PM   #19
AndrewT is offline AndrewT  Scotland
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You have a choice: research the literature, or buy the testing equipment and repeat the experimental research.
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Old 2nd July 2013, 08:30 AM   #20
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I'll just start assembling this one
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