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Old 28th October 2012, 04:12 PM   #1
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I am just putting here this article:
Gain-X2 - LME49811 15-150Watt Gainclone amplifier

... it is kind of follow-up on this:
Gain-X - LM1875 2*20Watt Gainclone amplifier

I am right to think that this is extremely useful?
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Old 28th October 2012, 05:44 PM   #2
Nisbeth is offline Nisbeth  Denmark
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Well, it isn't bad as such but the PSU design for the LM1875-amp is completely off! Is it your site?

/U.
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Old 28th October 2012, 07:51 PM   #3
AndrewT is offline AndrewT  Scotland
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Gainclone is a specific topology around an integrated Power IC, or chipamp.
Your X2 has no resemblance to a chipamp.
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Old 28th October 2012, 07:54 PM   #4
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Quote:
Originally Posted by Nisbeth View Post
Well, it isn't bad as such but the PSU design for the LM1875-amp is completely off! Is it your site?

/U.

That is actually my site...

Chip Amp Photo Gallery

And what do you mean by competely off?
Of course the regulating is not necessarily necessary... ;-)
But in that particular case the 24v transformer would have killed the opamps in no time...
That psu is also a compromise between power and size... And how much power does a 15W gainclone actually require from the psu??? Not 100W for sure - if it is regulated.

Step 1: Understand the voltage limits of the opamp.
Step 2: Make a PSU that does not brake those limits.
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Old 28th October 2012, 08:01 PM   #5
AndrewT is offline AndrewT  Scotland
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There are no opamps listed in either X or X2 amps.
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Old 29th October 2012, 07:17 AM   #6
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Could someone please define an operational amplifier for me.
Must it be implemented with valves to make one?
As I understand, ideal opamp has:
  • Infinite input impedance
  • Zero output impedance
  • Infinite gain
  • Zero propagation delay
Now let us make a list here...

If none fulfills the criteria, let's just call them all differential amplifiers then...

Also all suggestions wellcome about my site.
It is still under developement but I can see google has already googled it...
I was going to 'release' it a bit later, but since it is now here, we might as well do it - now.
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