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Old 5th November 2005, 04:08 AM   #1
sasha is offline sasha  Canada
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Default Gainclone on steroids

Hello guys,
Since we all agree Gainclones sounds good, why not to go step
further and do something about main complain they receive.
Not enough power or in some cases current.
Why not simply use Gainclones as driver stage and add some
power transistors. Gainclone is powerful enough to drive
many output transistors. We could use one chip in complementary
output topology or two chips (one in inverting mode and one in non-inverting mode) for quasi-complementary topo.
Also, since drive stage has very low distortions output may be
with no feedback. My quick calculation shows it is possible to get
200W with separate B+ for outputs. If you prefer bipolar or maybe mosfets no problem. Also a-class is possible.
Any comments?
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Old 5th November 2005, 04:16 AM   #2
Nordic is offline Nordic  South Africa
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Drop us a sample circuit and you are sure to start a discussion...
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Old 5th November 2005, 04:32 AM   #3
sasha is offline sasha  Canada
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Something like this.
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File Type: jpg 2005-11-04 21-33-29.jpg (22.3 KB, 1967 views)
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Old 5th November 2005, 04:39 AM   #4
thejohn is offline thejohn  South Africa
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Have a look at the LM4702 thread as well. Very new device so there's not too much info on how it's going to sound but interesting nonetheless.
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Old 5th November 2005, 04:41 AM   #5
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Yeah, but when you start adding more opamps and a big discrete output stage, it's really no longer a Gainclone.

This will give you a Gainclone on steroids:

Apex PA-03



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Old 5th November 2005, 04:55 AM   #6
Nordic is offline Nordic  South Africa
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Well the now famous RevC solution is also not a gainclone, but its still a chipamp.
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Old 5th November 2005, 04:59 AM   #7
sasha is offline sasha  Canada
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My opinion is that sound quality or lack of it originates in gain and
drive stage not in output so with little luck we can still retain that
"sweet" sound of GC.
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Old 5th November 2005, 06:35 AM   #8
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Default Re: Gainclone on steroids

Quote:
Originally posted by sasha
...My quick calculation shows it is possible to get
200W with separate B+ for outputs.
Any comments?
Never thought of using only 4 LM3886 to get 200 Watts? You have also ready made pcb's for that!

One way to sort things out is to state possible pros and cons with your concept. I can't see any obvious advantages.
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Old 5th November 2005, 07:54 AM   #9
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A long, long, time ago, I seem to remember Circlotron creating a Quad current dumping type output stage for GCs...

:edit: Yup. Here it is:

Gainclone with current-dumping afterburner!!
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Old 5th November 2005, 02:52 PM   #10
sasha is offline sasha  Canada
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Hi Pinkmouse,
That's what I am talking about. I guess I didn't dig deep enough to
find this tread ( so many of them). Thanks for the link.
Peranders,
Yes, 200W with 4 chips is possible but it will work only for friendly loads.
If you have e-stat. probably not.
This way current possibilities are almost unlimited.
Regards.
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