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Old 10th April 2003, 12:23 AM   #1
Guiness is offline Guiness  United States
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Default What do you think of this lm3886 circuit...

What do you think of this schematic for a nice 100w subwoofer amp?. Anything you could improve? The powersupply would include a 15V 300VA, maybe higher and lots of capacitance.

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Old 10th April 2003, 12:54 AM   #2
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Default 3886 T

Well, I have a lot of complaints. This seems to be a solution to run bridged 3886t's at 4 ohms. or, to put it another way, reduce the rail voltage to a level that one will tolerate 2 ohms. The 3886 is not designed for this, and will probably go into SPIKE protection.
Solution-PARALLED 3886'S with a 23/23vac (at 4 amp) transformer, giving 30-30 rails, dividing the power at about 38W each between 2 devices. That's the right level of power for these babies. If it's eight ohms, ONE ic at 30-30 DC, for subwoofer use. Discretes will make a better sub amp, at 36-36v, or even more.
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