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Old 11th August 2004, 04:14 PM   #11
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I think that TI discontinued the LM12.

Anyway, I tested the OPA541AM (TO-3), it has 10A current too.
TI asked $80 for each of these beauties, but it seams that now they are not available.
While it has very good bass, the rest is not up to the standards of sound quality of an LM3886, or LM3875, or LM4780, or even the LM1875.
But it's very good indeed, some people may prefer the "warmer" sound of the OPA541.
I just feel that it doesn't have that magical midband, treble and detail of the National chips.
The LM3886 has "typically" 11.5A current, and it's what I use.
I don't use the LM3875 for a long time...
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Old 11th August 2004, 04:19 PM   #12
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National Semi makes the LM12CL:
http://www.national.com/pf/LM/LM12CL.html
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Old 11th August 2004, 04:26 PM   #13
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Quote:
Originally posted by raidfibre
National Semi makes the LM12CL:
http://www.national.com/pf/LM/LM12CL.html
Sorry for the confusion, yes, National.
Although they don't have samples, they still sell them.
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Old 11th August 2004, 07:28 PM   #14
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the first thing that came to my mind would be the combo of the LM4651 and 4652. it's a class D subb amp delivering 170w of power.

just a thought
marius
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Old 11th August 2004, 07:41 PM   #15
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although technically cheating, bridging (or paralleling) the two amps inside an LM4732 (50Wx2) or an LM4780 (60Wx2) would give you around 100 and 120Watts respectively from a single package

would save some PCB space too
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Old 12th August 2004, 03:01 AM   #16
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Quote:
Originally posted by demogorgon
the first thing that came to my mind would be the combo of the LM4651 and 4652. it's a class D subb amp delivering 170w of power.

just a thought
marius
yep, thats what I thought, but I can't find a decent pcb i can make myself. Anybody have one? 1 layer preferred, but two sided can be done.
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Old 12th August 2004, 03:12 AM   #17
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The datasheet has a board layout but it is unfriendly to most methods of prototyping since it has very small clearances between traces. I would like to do a run of these boards at a professional facility but I don't have the money or time to finance it.
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Old 12th August 2004, 12:11 PM   #18
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same here...
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Old 12th August 2004, 12:47 PM   #19
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Contact TI, they sell the PCBs that they have on their appnotes.
Maby they have that one available.
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Old 12th August 2004, 12:56 PM   #20
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If class D is what you want I have a new design for a class D amp in progress. It should be able to deliver a lot of power and be fairly simple.
More info as I figure out if it's practical.
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