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Old 18th February 2003, 04:11 PM   #1
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Default Is this site correct?

Is this site correct: http://www.hilberink.nl/amps/lm3875schema.htm
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Old 18th February 2003, 04:16 PM   #2
JBL is offline JBL  Canada
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Yes and a little of no.

IMHO it is just mis interpreted datasheet wich give a typical and general appilications and supose that the readers is knowledgable of electronic.

So thopse issue are not to be affraid of.

Especially the power suplie. Those capacitor are dwcoupling cap and not really the power wich will contain more capacitance.

etc etc...
///edit///
Also it was aimed for large scale oem manufacturer who want the cheapest solution. Us diy audio freak will modify it to taqilor our demand and specifications.
///edit///
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Old 18th February 2003, 04:29 PM   #3
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I would rather say, yes a bit, and no in large extend.

As to capacitance issues in PS, it is my opinion, that less is better.
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Old 18th February 2003, 05:25 PM   #4
JBL is offline JBL  Canada
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Hmmm peter why that.

This is against the main flow in this forum who kind of like Farads and farads of capacitance.

(I like to be somwhere on the resonable side for that)
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Old 18th February 2003, 05:32 PM   #5
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Check this post: http://www.diyaudio.com/forums/showt...756#post130756

I also believe that some sonic properies of gainclone are due to small capacitance of PS. I've buit them with only 2000u per channel and wouldn't change anything. The bass is better than some other designs featuring countles kilos of capacitance.
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Old 18th February 2003, 06:43 PM   #6
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Default About supply caps

Quote:
Originally posted by Peter Daniel
I would rather say, yes a bit, and no in large extend.

As to capacitance issues in PS, it is my opinion, that less is better.
I am normally not so considered about Enormous Cap Banks in PSU.
(Some amps are more demanding. No rule without exception.)
In that way I am no different from Rod Elliot.
He does not advocate use of excessive, unnessesary PSU capacitors.
But then his amplifier projects do not need them.
His designs are based on evaluation done with instruments.
----------------------

I would rather prefer several low impedance caps of moderate size, than big "slow" Eletrolytes.
There are caps of low impedance for good prices from the far eastern land.

Especially when we come closer to the working Semiconductors
in the amp, I would want smaller low impedance caps.
Parallelled if necessary.

/halo
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Old 18th February 2003, 07:14 PM   #7
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This page has shown up in discussion before. Right off the bat he loses all credibitlity when he says a quasi-complementary amp is unsuitable for hifi ... he has obviously never heard a NAIM amp.

There is almost an automatic knee-jerk reaction that a chipAmp can't be as good as gain-clones show they can be.

Quote:
Originally posted by JBL
This is against the main flow in this forum who kind of like Farads and farads of capacitance.
The 1st time i ran across smaller capacitance sounds better was with Hugh Dean's AKSA. It is easy to see how this could be -- eith more capacitance, you get a shorter charging period and that pushes the frequency of the hammering any cap-input supply takes up in frequency where it can be more bothersome. The small caps with the high PSRR of the chipAmps gives a situation where small is good.

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Old 18th February 2003, 10:20 PM   #8
alvaius is offline alvaius  Canada
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Perhaps then the best solution is a huge capacitor bank with good input filtering before the bank to limit the bandwidth of the charging circuitry for the caps...... which I personally find the most sonically pleasing, but that is just me.

With Gainclones, there is lots of feedback at lower frequencies which gives good power supply rejection so larger capacitances are not as much benefit. However good capacitors such that higher frequencies can be handled is essential.


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Old 18th February 2003, 10:38 PM   #9
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Quote:
Originally posted by planet10
This page has shown up in discussion before. Right off the bat he loses all credibitlity when he says a quasi-complementary amp is unsuitable for hifi ... he has obviously never heard a NAIM amp.
Or the Gaincard or the various Gainclones or any other amplifier which uses monolithic power opamps, which are also quasi-complimentary amplifiers.

se
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Old 18th February 2003, 10:47 PM   #10
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Quote:
Originally posted by Peter Daniel
I also believe that some sonic properies of gainclone are due to small capacitance of PS. I've buit them with only 2000u per channel and wouldn't change anything. The bass is better than some other designs featuring countles kilos of capacitance.
That could be due to the added distortion due to clipping because of the small caps being drawn down. Psychoacoustically, if you're presented with the harmonics of a bass tone without the actual bass tone, the brain tends to fill in the bass tone itself.

In fact, that's how the brain acts to a large degree when listening to music. It acts as an interpreter and interpolator. It has to seeing as our ears actually strip out quite a lot of information before anything's ever sent to the brain.

se
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