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Chip Amps Amplifiers based on integrated circuits

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Old 24th January 2013, 06:33 AM   #11
Mooly is online now Mooly  United Kingdom
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Thanks for the update. Good job it was only a test speaker that fried.
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Old 24th January 2013, 12:46 PM   #12
iggy111 is offline iggy111  Croatia
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@johnr66 - well I've seen more than one implementation of this ground lifting by expert members here, so I wanted to try for myself, though I would have to test for any audible advantages - reducing noise would presumably be one of them.

@Redshift187 - so if I hook up a Velleman K4700 speaker protection unit, would that save me from using Cin and Ci?
Now my goal is to squeeze the best possible sound from the chip, and I think we all agree that "no Cin is the best Cin", apart from expensive Mundorfs and such. Right?

If you take into consideration that I actually use only one source at a time, and always measure for output DC, I think it puts me in kind of safe spot, and alows me to get the best sound.

I'm well aware that this is by far NOT the best practice of building amps, and that turning the source component on or off WHILE the amp is on - my speakers would probably die, at least after a few dozen times, because for example I measured DC of more than 4v on output when powering my portable mp3 player hooked to the amp...
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Old 24th January 2013, 01:02 PM   #13
JMFahey is offline JMFahey  Argentina
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C'mon, be serious !!!
You worry about the sound degradation a capacitor may introduce and then listen to
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portable mp3 player
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Old 24th January 2013, 01:11 PM   #14
Mooly is online now Mooly  United Kingdom
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Many portable players need a low value load resistor (circa 33ohms) to load the class D output stage correctly, something that is often overlooked.
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Old 24th January 2013, 02:00 PM   #15
iggy111 is offline iggy111  Croatia
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I used that mp3 player while testing for DC problems, cause I know it puts out a lot of DC while being powered on and off...

I use Rotel RCD-1072 and my PC with a EMU1212 soundcard for listening music.
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Old 24th January 2013, 03:35 PM   #16
johnr66 is offline johnr66  United States
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Quote:
Originally Posted by iggy111 View Post
@johnr66 - well I've seen more than one implementation of this ground lifting by expert members here, so I wanted to try for myself, though I would have to test for any audible advantages - reducing noise would presumably be one of them.
I wish one of the experts would explain it. Why not return the output side to ground through a .22 ohm resistor as well? (makes as little sense to me) Its as if they are afraid to return the signal to ground when it has to flow there anyway.

There is a lot of audio wizardry here, but also a lot of audio foolery such as:
Circuits with missing parts that compromise reliability and safety.
Added parts of questionable purpose.
Pushing parts beyond datasheet absolute maximum ratings.
Buying on price only. You often get stuck with counterfeit parts. They might work at first, but can fail eventually.
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Old 24th January 2013, 04:10 PM   #17
iggy111 is offline iggy111  Croatia
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Can't help you with all those questions...
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