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22nd September 2007, 09:39 AM
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#1 |
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diyAudio Member
Join Date: Dec 2004
Location: lelle
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LM3886 and +-42V
Hi there!
I would like to use my last amplifier's transformer for my new amplifier, which would be based on an lm3886, but that transformer gives out +-50VDC and +-41VDC. Does any one of you have experinece with lm3886 and +-41VDc? I mean that the datasheet states +-42VDC the as the limit. Will it stand it? Thanks! With regards, Semir |
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22nd September 2007, 02:01 PM
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#3 |
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diyAudio Member
Join Date: Dec 2002
Location: Houston
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Heatsinks
If you are driving a normal speaker, as far as efficiency and impedance this is a bit much. It looks perfect for 16 ohm speakers, gets more power output.
For normal use, try a paralleled LM3886. With 40 volt rails, you might get close to 100 watts out of it. George
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Cheapest is bestest |
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23rd September 2007, 06:04 PM
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#4 |
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diyAudio Member
Join Date: Mar 2006
Location: San Francisco, California
  
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Sounds great to me
 ≈40±VDC is the right voltage to go with. Just stay below 80VDC if you can  .
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23rd September 2007, 06:24 PM
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#6 | |
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diyAudio Member
Join Date: Mar 2006
Location: San Francisco, California
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Quote:
Maybe, and maybe not. Depends on how much you drive it and what you call "BIG" heatsinks. |
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23rd September 2007, 07:00 PM
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#7 |
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diyAudio Moderator
Join Date: Apr 2002
Location: Chatham, England
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Put it this way, a 15cmx18cm heatsink with 3cm deep fins got warm with just the quiescent current draw on my 42V rail LM4780. And no, it wasn't oscillating.
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Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort |
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