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Old 2nd April 2007, 03:27 PM   #1
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Default Need schematics and board files for parellel lm3886

hi,

I need the schematic and board files for parellel lm3886tfs. i tried making a schematic in eagle but its really difficult for me. This is my first project. im going to etch the pcb myself as i cant get it made here in my city.

im going t make a single sided pcb. if anyone can help making a board design in eagle that will be excellent. ill post the pic of the schematic taken from http://www.shine7.com/audio/pa100.htm.

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need board design for the psu also.

Click the image to open in full size.

and

Click the image to open in full size.

aso suggest which ps is better.

please guys help me.

cheers

clipto
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File Type: gif pa100_schematic.gif (19.8 KB, 373 views)
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Old 3rd April 2007, 04:38 AM   #2
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You can use following layout for monoblock and with slight modification you could parallel it. I made it for a friend, since I am not a big fan of 3886 there I never did a parallel or bridge for it otherwise its justa a matter of modifying the layouts for parallel or bridge. As for PSU I dont think you need a regulated PSU for gainclone.
LT 1083/4/5 has regulation volatages from 3.3 to 12 v which does not fullfill power requirements for 3886, and for LM317 you would need a transistor stage to improve output current of 317.
Normally a regulated supply is not used for gainclones.
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Old 3rd April 2007, 04:55 AM   #3
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schematics are as follows:
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File Type: pdf lm3886_schematics.pdf (14.4 KB, 137 views)
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Old 3rd April 2007, 03:43 PM   #4
Fenris is offline Fenris  United States
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Do you prefer SMT or through hole components? I have a single sided SMT design for an inverted LM3886 that will work with bridge or parallel. The only through hole components are a DC offset adjusting resistor and the larger capacitors.
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Old 5th April 2007, 12:08 PM   #5
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Quote:
Originally posted by Fenris
Do you prefer SMT or through hole components? I have a single sided SMT design for an inverted LM3886 that will work with bridge or parallel. The only through hole components are a DC offset adjusting resistor and the larger capacitors.

hi,

please send the files of your inverted lm3886.

can you explain what to use in library fo resistors caps etc. i dnt know how build a board design with exact dimensions of resistors caps etc.

also if anyone has the files for eagle or any other software of pa100 amp can you post it here? i need software files.

please help

thanks

clip
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Old 5th April 2007, 04:31 PM   #6
Fenris is offline Fenris  United States
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I'll post it tonight when I get home. I don't use Eagle, I use FreePCB. I can export to Gerber though.
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