X-Calibre : Hot Rodding Mauro Penasa's LM3886 design - Page 13 - diyAudio
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Old 14th December 2005, 07:21 PM   #121
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Thank you kind SIR
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Old 15th December 2005, 03:28 AM   #122
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Oi, not yet boertjie....

How far is my boards, wink wink, nudge nudge...
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Old 15th December 2005, 03:17 PM   #123
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Hi!!!!

I'm planning to build this amp but i dont know what kind of caps/voltage I should use for each one. I dont have enough knowledge to decide myself.

can anyone help me ?

THANKS!!!!
Jorge.
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Old 15th December 2005, 03:46 PM   #124
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rudi, are you planning a group buy for the boards of this amp or offering it like Brian and Russ is doing at TP? I am interested to get a set of the final boards and PSU boards too.
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Old 15th December 2005, 08:49 PM   #125
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Hi Jorge, i got your mail but i have the message still in my drafts box.

for the main caps 10 000 and the 220uf you can use anything above 40V 50 v would be better

the caps 100uf on the supply for th eLM318 you can use 25v and 35-50v for the speaker protection. the 470uf you can use anything above 25v but above 35v would be better

then regarding the group buy

I do not have permission form Mauro yet to make this commercial. but even if i do , i will only do it in the new year. I might even commission somebody to do this seeing that I do not have the time to really persue this to much

If there is anybody out there interrested in creating a group buy please contact me. I will speak to Mauro. but first and formost we have to respect his wishes
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Old 15th December 2005, 11:04 PM   #126
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Quote:
Originally posted by rudi
Hi Jorge, i got your mail but i have the message still in my drafts box.

for the main caps 10 000 and the 220uf you can use anything above 40V 50 v would be better

the caps 100uf on the supply for th eLM318 you can use 25v and 35-50v for the speaker protection. the 470uf you can use anything above 25v but above 35v would be better

then regarding the group buy

I do not have permission form Mauro yet to make this commercial. but even if i do , i will only do it in the new year. I might even commission somebody to do this seeing that I do not have the time to really persue this to much

If there is anybody out there interrested in creating a group buy please contact me. I will speak to Mauro. but first and formost we have to respect his wishes
Thanks!!!!!!
Jorge

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Old 17th December 2005, 07:31 AM   #127
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Default Final PCB

Ok I have been doing some work on this and made some changes. I can't see myself changing more than this,

you still have the option of regulators or just Zeners. i dumped the idea of having both

you have a semi-split ground plane for the Lm3886
and you also have various cap options for the Lm3886 supply and then you can also put a RC filter on the LM318 supply. all caps have been moved closer to the pins and tracks are as short as possible

there is now two LED on the board, speaker on and speaker off

PDF is A4 and the board should measure 175mm x 150mm

Enjoy
Attached Files
File Type: pdf x- component.pdf (70.5 KB, 385 views)
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Old 17th December 2005, 07:33 AM   #128
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Default Copper

Here is the Copper view from the component side

board measures 175 mm x 150 mm

print out on A4
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File Type: pdf x- copper.pdf (62.3 KB, 288 views)
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Old 17th December 2005, 07:35 AM   #129
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Default Silkscreen

silkscreen
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Old 17th December 2005, 07:38 AM   #130
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Default Alternative components

I have allowed for variations as mentioned.

here you can see the zener layout
RC filter caps
various caps sizes for Lm3886
Ref A conversion - you remove all components that says C next to the values
and the 3k3 bias resistor
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File Type: png alt components.png (31.0 KB, 1160 views)
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