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Old 15th September 2011, 10:38 PM   #31
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Hi,
I found this drawing that all of the options for the LM3886.

Regards,
tauro0221
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File Type: doc LM3886_DRAWING.doc (45.5 KB, 821 views)
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Old 16th September 2011, 08:12 AM   #32
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Hey tauro0221,

Thank you very much. Now I need to work how out to add these onto the XY Power Amp PCBs

Have a good day.

Regards,
Chris
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Old 26th October 2011, 06:52 AM   #33
hpq is offline hpq  Hong Kong
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Hello CharlieLaub,

Have you finished your project of LM3886 ? Does it produce good sound ?

I also want to build a Lm3886 power amp same as you. But I have few question regarding LM3886.

Do you add the speaker protection board between speaker and your LM3886 output ?

Do you add pre-amp board (NE5532 op-amp) infront of LM3886 input?

I searched some of forum or ebay, most of them also connect speaker protection board and pre-amp board for LM3886.

What is your comment ?

Regards
hpq
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Old 17th December 2011, 03:55 PM   #34
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Does anyone have component list?
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Old 30th December 2011, 11:31 AM   #35
epilot is offline epilot  United States
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Hi guys,

Thanks for all inputs.

Regarding the optional components actually I want to makes a prototype based upon the schematic in the datasheet and then I will improve it and add the optional components just if needed.
I have made the circuit directly based upon the schematic in the datsheet before (all components were connected to gather without any pcb) and it worked fine for me.

Ok I tried to modify the PCB as you noted. Plz kindly take a look at the new pcb and let me know your ideas.

Thanks a bunch
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Old 30th December 2011, 12:00 PM   #36
AndrewT is offline AndrewT  Scotland
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The loop area for PIN9 to PIN10 is enormous.
Expect trouble due to interference upsetting the unstabilised amplifier.
The loop area for PINs 4 & 5 via the two decoupling caps is even more enormous.
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regards Andrew T.

Last edited by AndrewT; 30th December 2011 at 12:04 PM.
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Old 4th January 2012, 01:02 PM   #37
epilot is offline epilot  United States
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Andrew,
Thanks a bunch for your reply,

Quote:
Originally Posted by AndrewT View Post
The loop area for PIN9 to PIN10 is enormous.
Sorry What do you mean by that plz? PIN9 is completely seperated from PIN10 so what do you mean by loop area here?


Quote:
Expect trouble due to interference upsetting the unstabilised amplifier.
What is interference upsetting?

Quote:
The loop area for PINs 4 & 5 via the two decoupling caps is even more enormous.
Yet I do not know what do you mean by loop area here so I do not know how to solve the problem.

Thanks

Last edited by epilot; 4th January 2012 at 01:20 PM.
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Old 4th January 2012, 02:04 PM   #38
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Hi Epilot.

Could you upload the pcb file to the forum. it would be a lot easier to modifiy the pcb and show you that way.. ps what pcb software are you using..

Regards Ian
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Old 4th January 2012, 07:47 PM   #39
AndrewT is offline AndrewT  Scotland
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Are you aware that an aerial that picks up interference is a loop?

Now start at PIN9 and follow the traces and components: to R701, to R702, through R702, to C555, through C555, to star ground, to Input PIN1, to PIN2, to R700, through R700, to PIN10.
Now shade in the area enclosed within that route.
That is your loop area. That is your aerial picking up interference.

You must make that group of components and traces and pins as small and as compact as possible and try to minimise the loop area.

Repeat for the output.
Repeat for the Zobel.
Repeat for the PSU rails.
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Old 4th January 2012, 10:07 PM   #40
epilot is offline epilot  United States
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Quote:
Originally Posted by madtecchy View Post
Hi Epilot.

Could you upload the pcb file to the forum. it would be a lot easier to modifiy the pcb and show you that way.. ps what pcb software are you using..

Regards Ian
Hi sir,

I am using the Proteus software to design the PCB's. If you have the software then just let me know so that I put the PCB file here.
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