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Old 18th August 2003, 07:33 PM   #1
Electrons are yellow and more is better!
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Default 200 watts Gäjnklon (Gainclone) - BPA200

The danish magazine High Fidelity, 2003/6 has a very nice project based on the application note from National. It's a Gainclone with 4 pcs. of LM3886. Pcb's are for sale, surprisingly nice looking.

Can anyone explain why the designer not has chosen standing LM3886?? Much easier to get good cooling.
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Old 18th August 2003, 08:46 PM   #2
Borc is offline Borc  Slovenia
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Old 18th August 2003, 09:03 PM   #3
joensd is offline joensd  Germany
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Would probably make a nice "low budget" high power amplifier.
What does the PCB cost or do you have a link?

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Old 18th August 2003, 10:51 PM   #4
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I share Peranders' worries about that heatsink, it looks far too small for 200w. I suspect if anyone builds this and wants it to run at reasonable power, (say, for a sub) it will need more.
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Old 18th August 2003, 11:00 PM   #5
jleaman is offline jleaman  Belgium
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Must provide link to get pcb YES!!!
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Old 18th August 2003, 11:08 PM   #6
UrSv is offline UrSv  Sweden
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Quote:
Originally posted by pinkmouse
I share Peranders' worries about that heatsink, it looks far too small for 200w. I suspect if anyone builds this and wants it to run at reasonable power, (say, for a sub) it will need more.
As far as I can see what's shown on the picture is the chips mounted to the L extrusion that would be attached to the main heatsink and also the mounting bar that presses the chips against the L extrusion. IMHO, if the project is aimed at the masses it is much better as the whole assembly of the amp channel can be done and then attached easily to the L extrusion and then you can fiddle as much as you want when attaching it to the main heatsink. This is the same way a great many projects ad kits do it in Elektor, ELV and many others. Standard issue it seems to me. Look at the app note and check the heatsinking for BPA-200. Not much needed in that config relatively speaking.

In designing my own bridge/parallell board I was always short on space for the supply rails and output. By laying the chips down you do two things which is to increase the space between board edge and chip to fit wide traces and you also make it possible to use that L extrusion. Pretty well implemented in my book. To bad the chip doesn't come that way in the first place (or I just missed that version).
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Old 18th August 2003, 11:11 PM   #7
moamps is offline moamps  Croatia
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Default Re: 200 watts Gäjnklon (Gainclone) - BPA200

Quote:
Originally posted by peranders
Can anyone explain why the designer not has chosen standing LM3886?? Much easier to get good cooling. [/B]

Hi,

You can place some more tracks on bottom layout with horizontally placed IC's. Allu L profile is good choice if someone sells kits. This profile can be easily thermally coupled with any big heatsink or metal chassis.IMHO
(Rowland's and Linn's chips are horizontally mounted too)

Regards

(edit: I 'm slooow)
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Old 19th August 2003, 06:45 AM   #8
Electrons are yellow and more is better!
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I think the cooling arrangements are for "musical" power.

The link is www.high-fidelity.dk and you have to get in contact with the editing staff. Price unknown.

When I write this I can reach the URL but I think it's the right one.
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Old 19th August 2003, 06:50 AM   #9
Electrons are yellow and more is better!
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Why is this project called "Das Modul"? The designer was tired of all fancy french names which noone can pronounce.

As a technical language german is wonderful!

Noise = Rausch (lovely!)
Apparatus = Gerät
Switch = Umschalter




What did you think of my swedish Gainclone spelling (see the subject line)?
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Old 19th August 2003, 07:47 AM   #10
UrSv is offline UrSv  Sweden
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The link is:

http://www.hifi.dk/
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