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Chip Amps Amplifiers based on integrated circuits

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Old 7th April 2012, 05:58 PM   #21
gootee is offline gootee  United States
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Originally Posted by Gopher View Post
Gootee

No I'm not kidding. The supplementary circuitry may have been designed by him but the amp circuit itself is standard so what bit of that did he design? It's just like all the zillions of other gainclones out there. In fact, it looks exactly the same as the Peter Daniel Audiosector implementation.
Oh dear! Gopher, I'm sorry but I am appalled by the shallowness (and the lack of decorum) of your statements, and that you have chosen to insist on persisting in the same direction.

Logically, I would also be forced to assume that you have made the same type of vacuous public insinuation about Peter Daniel's "design", in his thread. But I haven't checked. (By the way, the ESR of electrolytic capacitors does vary, quite significantly, with frequency.)

The reality is that everyone else already knows that the basic chipamp schematics are almost always roughly the same, and that, usually, because of that, any design talent or theoretical knowledge or engineering experience or expertise can mostly only begin to become apparent in the physical implementation design phase and possibly in any adjunct circuitry, or, as in Peter Daniel's case, in the design and implementation of physically/cosmetically-exquisite systems.

The physical circuit layout design is non-trivial and in the case of chipamps the design of the physical circuit layout is far more important than the schematic.

Even for a typical commercial electronic product development project, the schematic design's percentage of the total work effort involved in the project is in the single digits; usually the lower single digits.

I don't know what happened in the past but I can confidently suggest that, in general, a more-profound happiness can come from "building up" than from "tearing down".

I wish you well,

Tom
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Old 7th April 2012, 07:11 PM   #22
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Hello Tom

I agree, we all have seen the chip amp schematics before but in the end not all chip amps have the same sound and some don't even work.
I have made my own experience where I have tested several chips with direct pin to pin wiring and I ended up with the LM3875. But I don't want to start a new discussion about the right chip, everybody can make his own experiments.
But when I designed the first board I was not happy with the sound and the only way to make real improvements was a complete new PCB design in the end.
When I was happy with the sound of the amp I noticed a very loud noise everytime I switched it off.
To solve this problem I have installed some big relais as on/off protection for the speakers. This relais are also for DC protection because I have no coupling capacitors on the output of my active system.
As stated before the schematic for a gainclone design is not everything and I like what ljm_ljm has created and shared with us.
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Old 8th April 2012, 08:05 AM   #23
zyker is offline zyker  Malaysia
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Any option for LM3886?
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Old 9th April 2012, 06:30 PM   #24
Gopher is offline Gopher  United Kingdom
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Gootee

Oh dear. What a liberal dollop of typically American pseudo-psycho babble. I'm afraid you're taking it all rather too seriously. You probably think all brits are reserved and inoffensive and say 'cor blimey guv' all the time also. Where I come from we call a spade a spade, not a multi-purpose excavation implement.

I really think this whole Gainclone business has been done to death already. No matter how much you polish a turd, it's still a turd. How's that for decorum?

Last edited by Gopher; 9th April 2012 at 06:39 PM.
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Old 9th April 2012, 06:41 PM   #25
Mooly is offline Mooly  United Kingdom
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Originally Posted by Gopher View Post
No matter how much you polish a turd, it's still a turd.
Polished chip amps always sound better though... the latest audiophile accessory,
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Old 9th April 2012, 06:47 PM   #26
Gopher is offline Gopher  United Kingdom
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Careful mooly, someone will be asking you where you got it from. Could be an opening for someone to separate the audiophools from their money there.
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Old 11th April 2012, 01:14 AM   #27
gootee is offline gootee  United States
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Quote:
Originally Posted by Gopher View Post
Gootee

Oh dear. What a liberal dollop of typically American pseudo-psycho babble. I'm afraid you're taking it all rather too seriously. You probably think all brits are reserved and inoffensive and say 'cor blimey guv' all the time also. Where I come from we call a spade a spade, not a multi-purpose excavation implement.

I really think this whole Gainclone business has been done to death already. No matter how much you polish a turd, it's still a turd. How's that for decorum?
Whatever.
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Old 11th April 2012, 04:50 PM   #28
ljm_ljm is offline ljm_ljm  China
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Well I know GC3875 may be any one person are aware of.

So I do not think this is a private use. Because it is too much.

This is not a new power amplifier produced it, and want to use the design concept

I hope to be a reference to any previous one GC3875. To improve progress. This design,

The most important is not the IC 3 875, but the innovation of the circuit board design style.
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Old 11th April 2012, 04:53 PM   #29
ljm_ljm is offline ljm_ljm  China
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In this circuit board has for many years of analog circuit some of the views.

NS's chip power amplifier installation, ease of use.

It is more mature compared to the next.

Again the LM3875 is not a new circuit board.

But a new concept, with a classic chip power amplifier above and, perhaps, this is just a memorial.

Thanks to National Semiconductor's chips.

Last edited by ljm_ljm; 11th April 2012 at 04:55 PM.
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Old 12th April 2012, 03:34 PM   #30
johnr66 is online now johnr66  United States
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I'd have power supply decoupling film caps near each IC.
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