400VA in an LM4780? - Page 2 - diyAudio
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Old 1st April 2013, 03:04 AM   #11
gootee is offline gootee  United States
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I can't see any reason to disagree. I think it's always best to use the highest-voltage transformer that can safely be used. Then you can have the most headroom possible, to avoid clipping, which is the most-likely way to damage your speakers. And it won't take as much reservoir capacitance to get the headroom, although you might still want a lot just to have lower ripple and sufficient transient current capability.
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Old 1st April 2013, 05:12 AM   #12
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Quote:
Originally Posted by mortron View Post
Does it require any type of soft start etc?
Hi there,

With 400va you may want to add a softstart. The problem is the initial current inrush. In my first LM3886 the breaker occasionally came in. In my latest gainclone I use a softstart that I bought off the bay for $20 (ready to use) and it works fine with 2x400 va mono setup.

Best

Michael
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