Gainclone on steroids

sasha · 5th November 2005, 04:08 AM

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?

Nordic · 5th November 2005, 04:16 AM

Drop us a sample circuit and you are sure to start a discussion...

sasha · 5th November 2005, 04:32 AM

Something like this.

thejohn · 5th November 2005, 04:39 AM

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.

Steve Eddy · 5th November 2005, 04:41 AM

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

se

Nordic · 5th November 2005, 04:55 AM

Well the now famous RevC solution is also not a gainclone, but its still a chipamp.

sasha · 5th November 2005, 04:59 AM

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.

peranders · 5th November 2005, 06:35 AM

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.

pinkmouse · 5th November 2005, 07:54 AM

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!!

sasha · 5th November 2005, 02:52 PM

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.

5th November 2005, 04:08 AM	#1
sasha diyAudio Member Join Date: Aug 2002 Location: Canada	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?

5th November 2005, 07:54 AM	#9
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	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!! __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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5th November 2005, 04:16 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	Drop us a sample circuit and you are sure to start a discussion...

5th November 2005, 04:39 AM	#4
thejohn diyAudio Member Join Date: Mar 2005 Location: Cape Town, South Africa	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.

5th November 2005, 04:41 AM	#5
Steve Eddy diyAudio Member Join Date: Sep 2002 Location: Sacramento, CA	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 se

5th November 2005, 04:55 AM	#6
Nordic diyAudio Member Join Date: Sep 2005	Well the now famous RevC solution is also not a gainclone, but its still a chipamp.

5th November 2005, 04:59 AM	#7
sasha diyAudio Member Join Date: Aug 2002 Location: Canada	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.

5th November 2005, 02:52 PM	#10
sasha diyAudio Member Join Date: Aug 2002 Location: Canada	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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