GainConcept No.5 - diyAudio
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Old 17th May 2005, 11:25 PM   #1
Stabist is offline Stabist  Slovenia
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Default GainConcept No.5

In last months I've been quite GainBuildingMan ...

This is the last of them for now - 5th in the row to be exact - each of them different - from the first with LM1875 (the only to be not so sucesfull), followed with LM3886 "Patek", then experimenting by OPA541/OPA2604 combination (which shows a lot of potential but it still needs a proper chassis), then one with LM1875/NE5532 combination - just to improve bad taste from first attempt - it suceded
- and recently a friend of mine supplied me with a pair of OPA541 and OPA627 and some other parts (2 trannies, chassis, etc) - so I decided to fiddle a bit - and so GainConcept No.5 was born

Not yet tested on my main speakers - but so far it sounds very promising ...

It has +/-30V on chip rails and total gain around 33, 10k log 12 step attenuator, etc ...
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Old 17th May 2005, 11:27 PM   #2
Stabist is offline Stabist  Slovenia
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interiour
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Old 17th May 2005, 11:28 PM   #3
Stabist is offline Stabist  Slovenia
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attenuator
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Old 17th May 2005, 11:30 PM   #4
Stabist is offline Stabist  Slovenia
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in action
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Old 17th May 2005, 11:31 PM   #5
Stabist is offline Stabist  Slovenia
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Old 17th May 2005, 11:32 PM   #6
jleaman is offline jleaman  Belgium
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Default Re: GainConcept No.5

Quote:
Originally posted by Stabist

Not yet tested on my main speakers - but so far it sounds very promising ...


NEVER EVER test your first powered up amplifier on your main speakers I always use a cheap or free driver : O ) and run it for several hours. Ive seen speakers on tested first build amps. They don't smell to well either.
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Old 17th May 2005, 11:33 PM   #7
Stabist is offline Stabist  Slovenia
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last one for now
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Old 17th May 2005, 11:36 PM   #8
Stabist is offline Stabist  Slovenia
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@jleaman - yep - as said - he doesn't deserve yet to get connected with main amin speakers - for first few hours he had to be satisfied with some old car units ...

Now it's feeding some old Samsung speakers ...

And in the morning - if everything OK - it will be tested on my main system ...
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Old 18th May 2005, 12:22 AM   #9
DC Dave is offline DC Dave  United States
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Nice looking chassis. What are the dimensions? Also any functional reason for two LEDs opposed to one? Let us know how it sounds.
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Old 18th May 2005, 12:31 AM   #10
XELB is offline XELB  Portugal
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It looks really nice good job



In my opinion you should not use in the output those thin cables.
I think there is no point in having thick speaker cables if the output in the amplifier doesn’t have nice cables(inside).
For testing you can use that ones but once you have finish the amp you should consider change the cables for something better.
It’s just my opinion and tip.


Ps: I use speaker cable. 2x1,5mm oxygen free for each “banana output”
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