LM3886 Schematics + PCB - Page 13 - diyAudio
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Old 22nd June 2012, 08:38 PM   #121
udailey is offline udailey  United States
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With D2 reversed you were dumping DC from the power supply into the trace that is the output of the amp. So the feedback resistor did its job and dumped DC into the input of the amp, a lot of DC, and the amp tried to amplify the DC signal. So you were dumping full volume DC out of the amp. I think this is what happened and why you had it heating up so fast.
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Old 23rd June 2012, 04:02 AM   #122
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Quote:
Originally Posted by udailey View Post
With D2 reversed you were dumping DC from the power supply into the trace that is the output of the amp. So the feedback resistor did its job and dumped DC into the input of the amp, a lot of DC, and the amp tried to amplify the DC signal. So you were dumping full volume DC out of the amp. I think this is what happened and why you had it heating up so fast.
But even after all this, nothing has happened to the chip yet!
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Old 23rd June 2012, 03:38 PM   #123
udailey is offline udailey  United States
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Its a pretty awesome chip. Hard to hurt and hard to get bad sound out of it. Fun to play with and a great amp to learn some basics about power amps and opamps at the same time. Also a great reference. If you have a LM3886 or similar chip and you make an amp then its a good reference to compare any other amps you build/design to.
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Old 23rd June 2012, 05:33 PM   #124
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True that!!
Anyways thanks a lot for all your help!
Cheers!
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Old 4th November 2012, 05:37 PM   #125
Vostro is offline Vostro  South Africa
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Just slapped it together to see how it sounds,

And must say lovely small pcb and amp.

Thanks

Ill put a decent heatsink on it later
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Old 4th November 2012, 08:51 PM   #126
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Originally Posted by Vostro View Post
Just slapped it together to see how it sounds,

And must say lovely small pcb and amp.

Thanks

Ill put a decent heatsink on it later
Nice work
Regards
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Old 6th December 2012, 11:19 PM   #127
lelut is offline lelut  Indonesia
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Hi apex,

this is my LM3886T project, and nice combine with my new small speaker 6"

BR,
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Old 7th December 2012, 08:16 PM   #128
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Originally Posted by lelut View Post
Hi apex,

this is my LM3886T project, and nice combine with my new small speaker 6"

BR,
Nice work,
Regards
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Old 10th December 2012, 04:45 AM   #129
lelut is offline lelut  Indonesia
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Originally Posted by apexaudio View Post
Nice work,
Regards
Hi Apex,

i want to ask about component for this Amp,
how much difference sound, if using good quality components or using component like i used at the picture? only poor ceramic capacitor, and other.

i need advice for that, before plan to buy good quality component,
have much different or not, because for now the sound is good enough.

thanks Apex,

BR,
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Old 11th December 2012, 05:00 AM   #130
lelut is offline lelut  Indonesia
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Quote:
Originally Posted by lelut View Post
Hi Apex,

i want to ask about component for this Amp,
how much difference sound, if using good quality components or using component like i used at the picture? only poor ceramic capacitor, and other.

i need advice for that, before plan to buy good quality component,
have much different or not, because for now the sound is good enough.

thanks Apex,

BR,
anybody, can help me??
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