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PostPosted: 31 Dec 2008, 15:25 
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Joined: 31 Dec 2008, 15:23
Posts: 1
I'm looking at the power supply for the Nanoo Gainclone, and it requires a 25v+25v 3.2A 160VA transformer, and I can't find anything like that for the 115v input from the wall in the US.

I'm wondering if someone has a lead, or if i have to mod the project, how would I?


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PostPosted: 01 Jan 2009, 09:40 
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Joined: 06 Jun 2008, 20:12
Posts: 972
Location: Houston, TX
You can use a AN2225 from Antek. You can find a good price on those at http://www.antekinc.com/price1.html.
That will do the trick perfectly.
Ri
So, keep us updated on your build! We are always interested in chip amp builds.

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PostPosted: 01 Jan 2009, 13:12 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Hi butterkitty, welcome the forum.
For a gainclone / chipamp, there is no fixed voltage you need to have, so 25V is not a fixed value. You will want to use a transformer that is in the order of about 200VA+ for stereo implementation. The voltage you would pick from the datasheet. For the LM3886, see the graph in this post:
viewtopic.php?p=2736#p2736
Note that the supply voltage is in DC so divide is by 1.4 to get AC. So a 25VAC (35VDC) is best suited for use with 8 ohm speakers.
Cheers

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