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Old 15th November 2009, 05:47 PM   #1
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Default Lm3886 pcb

Here is LM3886 PCB Plz Check that all the components are ok and it is ready or not? If not make it final for all.Click the image to open in full size.
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Old 15th November 2009, 06:39 PM   #2
AndrewT is online now AndrewT  Scotland
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C3 is too low in value. Try >=72uF
R6 &C6 are specified on the National datasheet.
Separate the signal ground from the power/decoupling/zobel/mute/speaker ground.
C3 and R2 must go direct to the signal input return/ground pad. Nothing else may be on this dedicated ground reference.
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Old 16th November 2009, 02:17 PM   #3
rajudp is offline rajudp  India
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Default lm3886

it is a working circuit from elektor electronics
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Old 16th November 2009, 02:20 PM   #4
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22 uF => 7 Hz, not particularly small.....
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Old 16th November 2009, 03:08 PM   #5
AndrewT is online now AndrewT  Scotland
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then the 2u2F at the input is wrong. F-3dB~3Hz
I'd prefer to keep the input cap and change the NFB cap to suit. My real preference would be 4u7F for the input and 150uF or 220uF for the NFB.

Otherwise the amp will develop some AC voltage across the NFB cap and thus increase avoidable distortion.

C3 >= sqrt(2) * C1 * [R2+R1] / R3
The ratio of R3 to R2 determines the ratio of C3 to C1.
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Old 16th November 2009, 04:08 PM   #6
Bone is offline Bone  United Kingdom
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According to the original article, with a regulated supply (+/- 35v) they got 100 watts rms from this circuit!!!
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Old 16th November 2009, 04:21 PM   #7
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Quote:
Originally Posted by rajudp View Post
it is a working circuit from elektor electronics
yes, it's small and has place for all the 'unnecessary' components, whether you fit them or not.
I have used it myself once in a multichannel project.
Small, cheap, fast to build and reliable operating...no complaints from me so far.
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Old 16th November 2009, 04:39 PM   #8
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Oh noooooo! Its always confuse me. its y i hav written make it complete. Now can u all guys decided which component should i use and their values as capacitors.
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Old 16th November 2009, 04:42 PM   #9
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by Bone View Post
According to the original article, with a regulated supply (+/- 35v) they got 100 watts rms from this circuit!!!
you'll believe everything you read on the net!

100W into 8r0 requires an output of 40Vpk and 5Apk.
How does one get this from +-35Vdc whether regulated or not?
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Old 16th November 2009, 05:02 PM   #10
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Quote:
Originally Posted by livenicely View Post
... its y i hav written make it complete....
... please, could write in proper english? I'm not familiar with this chat english.
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