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Old 3rd November 2004, 09:45 AM   #1
wxn is offline wxn  Lithuania
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Default Simple (or not so simple) decision

Hi everyone.
I've ordered recently a pair of toroidal 200W trafos with two secondaries of 25VAC, which results in about +- 35VDC.
The question is, which of the locally available chips should I use. The load will most probably be 8ohms, ~40W RMS towers. The best price/quality ratio chips here are LM3886 and LM4766. The first one wants 4ohms, the latter 8 ohms to show all their might. Now, if I get a pair of them per channel, I could bridge two LM3886 and get roughly 200W. And they would be quite happy with +-35V voltage.
The other option is to take two LM4766's and bridge/parallel them, which gives us around 180W. But their supply voltage limit is +-37V, so I could easily get nasty side effects from SPiKe.
Particularly, I don't see much difference in these two choices. Do You?
Any comments are welcome.
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Old 3rd November 2004, 03:42 PM   #2
wxn is offline wxn  Lithuania
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Anyone?
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Old 5th November 2004, 05:10 AM   #3
wxn is offline wxn  Lithuania
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No replies huh...
I think I'll just go with LM3886
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Old 5th November 2004, 05:34 AM   #4
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Why don't you start with one LM3886, maybe my QRP02 see if this is enough in power?

Ckeck here
http://www.national.com/appinfo/audi...gn_Guide13.xls
http://www.national.com/appinfo/audi...sign_Guide.pdf
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Old 5th November 2004, 09:55 AM   #5
wxn is offline wxn  Lithuania
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Those values in my first post were taken from this sheet.
Thanks anyway
And yes, probably You are right, bridging two LM3886 per channel (or to be exact, per bi-amped channel, 4 chips total per channel) is a bit overkill
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