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Old 31st July 2010, 04:35 PM   #1
Maxxtr0 is offline Maxxtr0  Germany
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Join Date: Sep 2009
Location: Bavaria
Default Selling: A Pair of LM3886 Gainclones

Hello folks!

Would anyone be interested in a pair of homebuilt LM3886 Gainclones?
Look here for the whole thread and here for the final Layout!
Also I have made a small rectifier-board with 8 MUR860 diodes which I would sell, too.


I finaly had time to build this Amp, but I donīt have any use for it, so I would sell it if anybody would want it.
Both Amps are tested and work well with a 18V trafo. (Which I am not selling here.)
Because I do not want to sell them for less than Iīve paid for the parts, I would like to have 40€ + shipping from Germany. (Thats about 50 US$ + shipping).


I may take pictures of it, if you ask for them.


Greetings,
Maxx

Last edited by Maxxtr0; 31st July 2010 at 04:39 PM.
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Old 1st August 2010, 05:38 PM   #2
Maxxtr0 is offline Maxxtr0  Germany
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Join Date: Sep 2009
Location: Bavaria
So here is a picture of the two amplifier boards and the rectifier.
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Old 2nd August 2010, 04:26 PM   #3
Maxxtr0 is offline Maxxtr0  Germany
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Okay, last offer: 30€ / 40$ + shipping.
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Old 2nd August 2010, 07:10 PM   #4
srinath is offline srinath  United States
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How to get this useable. What would I need ?
Sorry I am going to read the build thread, but it is 8 pages so it may take a while.
Thanks.
Srinath.
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Old 2nd August 2010, 07:34 PM   #5
Maxxtr0 is offline Maxxtr0  Germany
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Join Date: Sep 2009
Location: Bavaria
You would need a 2 x 18V Trafo with 80VA - 160VA (the bigger the better) and one bigger or two smaller heatsinks.


And of course such things as the fuse, switches, cables, connectors and so on.
And you do know who to work with Mains-AC, yes?


So basically you need to connect the Trafo to the rectifier-board. Then you have to wire the outputs of the rectifier board to the two Amps boards. Finally you only have to solder the speakers and the input onto the Ampliefier-boards. But you can read that in the other thread!

Last edited by Maxxtr0; 2nd August 2010 at 07:43 PM.
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Old 2nd August 2010, 10:32 PM   #6
srinath is offline srinath  United States
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Join Date: Feb 2010
OK I have a question - is it possible to get this to work on DC. DC power supplies are cheap. Big transformers are much more $. I think that 3886 needs 18v minimum and needs that AC if I remember.
I know how to work with AC yes, but I am drowning in projects and getting a transformer I dont want to take it on.
Thanks.
Srinath.
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Old 3rd August 2010, 07:24 AM   #7
Maxxtr0 is offline Maxxtr0  Germany
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Join Date: Sep 2009
Location: Bavaria
Of course you could leave out the rectifier. Then you only would need a +18V / GND / -18V DC power supply (Or maybe a even a little bit higher Voltage, because when you rectify 18V there are a little more then 25V in the end.).

It would only be important that there is as less noise produced by the DC-powersupply as possible and that it is able to deliver enough current when needed.


Greetings,
Maxx
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Old 3rd August 2010, 01:05 PM   #8
srinath is offline srinath  United States
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OK 25 0 -25 DC and I have to find one with very little noise. Now what I would be doing is getting a lap top or printer power supply. Is that low noise ?
Thanks.
Srinath.
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Old 3rd August 2010, 05:03 PM   #9
Maxxtr0 is offline Maxxtr0  Germany
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I donīt know but I think it should word pretty well.
But a notebook-powersupply delivers only +25V and Gnd. Whatīs with the -25V?



Greetings
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Old 3rd August 2010, 07:23 PM   #10
srinath is offline srinath  United States
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I will check some stuff out and let you know. I just wasn't saying only laptop power supply. Lots of em are around in various electronic piles.
Cool.
Srinath.
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