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Old 14th December 2003, 07:37 PM   #1
2Bak is offline 2Bak  Denmark
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Default PCB for Inverted Gainclone

Please find attached PCB layout for IGC, suitable for multichannel GC poweramps. My friend Max made them, and they are cute

The pcb layout was designed for using ERO MKP 1841 filmcaps
http://www.vishay.com/docs/26019/mkp1841.pdf
and Caddock MP915 0,22 R at output.
1000uf's are Elna snap-in types, a bit larger than for example Panasonic FA or FC's, but those will fit also.

Both of these two circuit variations can be used:

http://ampchipdiy.com/invertedLM3875_r2_1.gif
http://home.comcast.net/~greggbaker/invertedLM3875.gif

Suitable pwr-bridge circuit/pcb could be this one:
http://www.diyaudio.com/forums/showt...537#post269537

PCB was designed so that the unused pins of LM3875T should be cut of.

/Jan
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File Type: zip gainclone.zip (29.8 KB, 492 views)
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Old 14th December 2003, 07:39 PM   #2
2Bak is offline 2Bak  Denmark
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Default circuit and components side

another zip
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File Type: zip igc_circuit_components.zip (81.1 KB, 369 views)
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Old 14th December 2003, 07:44 PM   #3
2Bak is offline 2Bak  Denmark
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Default it looks like this..

(not scale 100% when printing out, use the pdf-file in the Gainclone.zip instead).
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File Type: gif layout.gif (12.6 KB, 1298 views)
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Old 14th December 2003, 07:48 PM   #4
2Bak is offline 2Bak  Denmark
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Default componets side

components side
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File Type: gif layout2.gif (22.7 KB, 1279 views)
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Old 14th December 2003, 10:37 PM   #5
cm961 is offline cm961  Canada
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Your friend's design looks terrific. Thanks for taking the time to post it!

The DIY Audio community appreciates your efforts.

Pete
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Old 18th February 2004, 11:02 PM   #6
2Bak is offline 2Bak  Denmark
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Default Amp finished

See more pictures and details here:
http://2bak.homepage.dk/gainclone.htm

/Jan
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File Type: jpg gc4-1.jpg (77.9 KB, 852 views)
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Old 18th February 2004, 11:42 PM   #7
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Very nice looking, indeed.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
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Old 19th February 2004, 08:25 AM   #8
palesha is offline palesha  India
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We were very much impressed with the picture of bridge pcb posted on 11-23-2003. i will like to know which software u used to draw the same. Waiting for ur reply
Mahendra Palesha
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Old 19th February 2004, 09:09 AM   #9
2Bak is offline 2Bak  Denmark
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Quote:
Originally posted by palesha
We were very much impressed with the picture of bridge pcb posted on 11-23-2003. i will like to know which software u used to draw the same. Waiting for ur reply
Mahendra Palesha

My friend who did the pcb layout used Circad.
An evaluation copy can be dowloaded at http://www.holophase.com/

/Jan
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