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Old 20th May 2013, 04:37 PM   #51
iggy111 is offline iggy111  Croatia
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I'm doing the changes now according to post#40, and some other things I was postponing. It will take some time so I will post again tomorrow after a listening test.

If all the patients survive, that is
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Old 20th May 2013, 04:41 PM   #52
iggy111 is offline iggy111  Croatia
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Quote:
Originally Posted by minifly View Post
Would it be possible to connect Cc to gnd instead of -IN? Then it will work properly as an RF filter.
Yes, that cap will go from IN+ to GND. I'll just have to see if it fits across to pin7 (gnd) because I will solder the HF decoupling ground to pin7, so it could be crowded.
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Old 20th May 2013, 10:09 PM   #53
AndrewT is offline AndrewT  Scotland
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The Rf cap goes to Signal Ground. Do not connect it to pin7.
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Old 22nd May 2013, 04:28 PM   #54
iggy111 is offline iggy111  Croatia
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Well, the patient didn't survive...
I opened a new thread to get to the bottom of the problem, link here

PS Andrew, I didn't do a ground lift to separate signal ground from power ground, that's why I meant to solder it to pin7. Should I do that?
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Old 22nd May 2013, 04:37 PM   #55
AndrewT is offline AndrewT  Scotland
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Think about what you are proposing.
You are adding an RF attenuation to the Hot/Signal input.
Where is that coming from?

I reckon it is coming from the input cable. That cable connection is a two wire connection.
If you need to attenuate RF on that two wire connection then the Capacitor MUST go across Hot?signal to Cold/Return. Not to power ground.

If you are concerned about common mode interference, then both wires in the two wire connection must be cap connected to Chassis. Not to Power Ground.
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Old 23rd May 2013, 11:24 AM   #56
iggy111 is offline iggy111  Croatia
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Check. And again, I shouldn't post when I'm tired
I guess the optimal place for that RF cap is across IN and SG (return) on the PCB underside.

Will do that as soon as I solder in a new chip, as one of them died.

As far as my initial problem goes - the healthy right channel seems not to be "bloated" any more, but more on that soon...
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