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Old 23rd December 2012, 04:50 AM   #11
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I don't really understand the desperation of most the experts here to force the LM3886 to be a dual supply direct coupled amp. The National datasheet for the LM3886 has a clear application diagram of a single supply amp with an output capacitor between it and the speaker. Having watched my capacitor coupled amp go up in flames a couple of times until I upgraded the heat rejection, without hurting the speakers, and seeing all the PA and guitar speakers with new cheap drivers at the music resale shop, I'm rather fixed on using the $5 electrolytic capacitor as a fairly foolproof speaker protection device. Especially when my speakers cost 4-8 times what the amp costs. Hint- an electrolytic cap biased to 20 or 40 volts doesn't go through slow (audible) chemical events crossing zero volts.
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Last edited by indianajo; 23rd December 2012 at 04:52 AM.
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Old 23rd December 2012, 04:57 AM   #12
AJT is offline AJT  Philippines
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any op-amp can be made to run on a single rail if one wants to, never mind what some experts say....specially those with nothing to show for in terms of completed projects....
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Old 23rd December 2012, 10:52 AM   #13
GeorgK is offline GeorgK  Austria
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@Tony: Of course it can but why? The TO has a complete schematic (or even a complete board) for dual supply, a schematic for a power supply, so what would be the use to rework all this in favour for a single supply?
Ok, the capacitor as a protective device is an argument - for the power amp. But in how many industrial guitar amps do you see such a configuration? How confusing should it become for a beginner?
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Old 23rd December 2012, 10:56 AM   #14
GeorgK is offline GeorgK  Austria
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Quote:
Originally Posted by Tony View Post
specially those with nothing to show for in terms of completed projects....
As far as I am concerned I make a living from electronics, not a showcase.
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Old 23rd December 2012, 12:36 PM   #15
AJT is offline AJT  Philippines
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oh no, it's not about you.....

i was just reacting to another poster re: operating on a single rail to which i agree can be done if one wants to....
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Old 23rd December 2012, 12:49 PM   #16
GeorgK is offline GeorgK  Austria
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ok, peace then...

One more word about output power: limiting power to eg undistorted 50 Watts does not mean you cannot destroy a 50W speaker when driving the amp heavily into clipping. Choose the power amp's gain wisely so to get a sensible range on the master volume.
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