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Old 9th January 2004, 11:10 AM   #1
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Default Best Gainclone Design is?

I have been reading this forum trying to learn about these amps.

There seems to be so many different ways to build them.
Has anybody sat down and listen to them all? Is there an agreement as to which design is best?

If someone can point me to where to get a good pcb and design it would be welcome, cost is not an issue, I want the best.
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Old 9th January 2004, 11:57 AM   #2
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Well, how much power are you looking at? Are you looking at low power (about 0-20W) Medium power (about 21-70W) or high power (71W+)?

Low power, the best is the LM383, an 8W chip. it sounds great, but has been discontinued, so if you can get it it might cost a bit more. Also, the LM1875, a 20W chip is good.

Medium power, The LM3886, a 68W into 4-ohm chip. It also has a mute.

High power, I don't know. The LM4651/52 looks good, but ive never used it or any other class d amp before.

Hope this helps, Mike
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Old 9th January 2004, 01:41 PM   #3
Ropie is offline Ropie  United Kingdom
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For the beginner, one of the best places is the Decibel Dungeon website - there you can follow a step-by-step guide to hard-wiring (no pcb involved) your own inverted gainclone (amongst other things) using the LM3875 chip.

Whether or not it is 'the best' is a different issue - there is no such thing and you hear arguments for and against each type, with nobody really coming to any conclusion - most people seem to eventually build them all anyway If somebody tells you type 'whatever' is the best, they are lying. If you are indeed a beginner, best to keep it simple so follow the basic inverted GC on DD.
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Old 9th January 2004, 02:09 PM   #4
GregGC is offline GregGC  Canada
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Quote:
Originally posted by Ropie
For the beginner, one of the best places is the Decibel Dungeon website - there you can follow a step-by-step guide to hard-wiring (no pcb involved) your own inverted gainclone (amongst other things) using the LM3875 chip.

Whether or not it is 'the best' is a different issue - there is no such thing and you hear arguments for and against each type, with nobody really coming to any conclusion - most people seem to eventually build them all anyway If somebody tells you type 'whatever' is the best, they are lying. If you are indeed a beginner, best to keep it simple so follow the basic inverted GC on DD.

I agree with most of it. The only comment is the Inverting GC COULD be more prone to oscillation than the NIGC (LM3875) (depends on the actual layout and setup). For NIGC is easier to get higher input impedance without a preamp (10k vs 22k or more; whether you need it or not is your call). Higher Zin would give you better base if you use marginal value Cin (if you have one, I don't use any).
Sound: Different opinions on that. Well assembled amps would sound the same to me (I don't have very sensitive years, though the dif between the GC and The 70W Yamaha is so big in favour of the GC).
I'm extremely happy with what I build (NIGC, no preamp). Sounds incredible to me.

http://home.ca.inter.net/~cfraser/Gainclonehome.htm
http://www.platenspeler.com/diy/uk_index_body.html
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Old 9th January 2004, 03:22 PM   #5
miguel2 is offline miguel2  Portugal
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Best Gainclone design is...

The one sitting on my living-room

Miguel

Warning: This is a joke. I am not responsible for its effects.
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Old 9th January 2004, 03:28 PM   #6
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The best design is given in National's application notes. You can further improve it by playing with components, or even reducing the parts count. I would strongly recommend using around 1000u on rails, if you want the best mids and highs clarity.

Recently, a new design emerged, which looks quite promising. If you consider it comes from one of the pioneers of GC movement, maybe you should try to built that one?

http://www.ampchipdiy.com/phpBB2/vie...900b95399fb69c
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Old 9th January 2004, 05:49 PM   #7
Nuuk is offline Nuuk  United Kingdom
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Quote:
Recently, a new design emerged, which looks quite promising. If you consider it comes from one of the pioneers of GC movement, maybe you should try to built that one?
If you need to ask which is the best configuration, you are not ready to build that one!

There is no 'best' one! As has been said, choose one of the circuits and build it well, experiment with the components like Peter says and listen, listen and listen!

If you build a separate PSU section, it's not that expensive to build three or four amp circuits (as there are so few components) and then compare them for yourself.

I have described how I built both the inverted and non-inverted designs on Decibel Dungeon and I am too long in the tooth to say which is the 'best'!
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Old 9th January 2004, 08:47 PM   #8
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Peter Daniel: You recommand using 1000 uf for the rail, but if I only use one transformer, I need two 1000 uf cap on each channel or only two for the two channel ??? With one transfo, if I use two cap by channel, I will have 2 cap in parallele.....so 2000 uf and I don't think that what we need !

Thank
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Old 9th January 2004, 09:14 PM   #9
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I also use a single transformer, but run separate wires from the bridges to each channel, so the rails are somewhat separated. You want to have 1000u caps near the chips and you should use 4 of them per stereo amp.
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Old 9th January 2004, 09:17 PM   #10
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In reality, you have 2000 uf for the positive and 2000 uf for the negative ????
The only thing is important, it is to put the cap near the lm3875 ???
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