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Old 11th May 2013, 07:48 PM   #1
dnic77 is offline dnic77  United Kingdom
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Default chipamp lm3886 help

hi ive just put together th 3886 kit from chipamp and im getting nothing until i touch the front left pin of the chip with the + from the speaker then i get a pop and i connect speaker back up and it works but when i turn it up it turns of and i have to repeat the above

any help would be appreciated
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Old 12th May 2013, 10:51 AM   #2
dnic77 is offline dnic77  United Kingdom
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Anybody please?
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Old 12th May 2013, 01:55 PM   #3
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Your garbled English makes it really difficult to understand what's happening. Please use Google Translate,

But when you say you turn it up and it goes off, it makes me wonder if you have it mounted on a heatsink.
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Old 12th May 2013, 02:12 PM   #4
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The LM3886 datasheet http://www.ti.com/lit/ds/symlink/lm3886.pdf shows that the left front pin (pin 1) is the V+ (positive rail voltage) so the fact that the speaker pops when you touch the speaker wire to this can be expected, and probably has nothing to do with your problem.
Fast Eddie D has a good point. The LM3886 will shut down if it overheats, and it will overheat if not heatsinked. Repeating your exercise of touching the speaker wire to pin 1 may just give the chip time to cool down, and have nothing to do with getting the amplifier to work.
I recommend attaching the chip to a heatsink, if not already. If that doesn't work, or if it's already heatsinked, I recommend posting a photo. Photos are really valuable in helping people diagnose problems.

Last edited by ByronInPortland; 12th May 2013 at 02:14 PM.
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Old 12th May 2013, 02:30 PM   #5
dnic77 is offline dnic77  United Kingdom
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Hi and thanks for the replies, sorry if it made no sense as I was a bit drunk!
The chips are attached to a heat sink and i will upload a pic later. Even when I stop the music and try restart it I have to touch the pins to here the music again.

Thanks again.
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Old 13th May 2013, 07:05 AM   #6
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Perhaps there is a construction error at the mute circuit?
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