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M3 Amplifier Board Schematics

post #1 of 8
12/17/07 at 4:28am
Thread Starter 
Guys,
I'm going to machine a chassis for an amp build and I need schematics for a few boards.
I need a CAD drawing for am M3 board with mounting hold diameters as well as heat sink hold diameters and locations. I'm going to machine a rigid support for my tall heat sinks and I need to place them with much accuracy. The picture on AMBs website is not good enough.
I also need a cad drawing with mounting hole dimensions and placement for the STEPS 1.2 power supply. I couldn't find any drawings with dimensions on Tangent's website.
Lastly, I need mounting hole dimensions for the Linkwitz crossfeed board.
Anybody got these?

Thanks guys!

-Bread
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post #2 of 8
12/17/07 at 4:53am
Shouldn't the larger versions of the board images be good enough...like
this one: http://www.amb.org/audio/mmm/mmm_pcb_silkscreen.pdf or the .png?
Can't you import that it into a CAD system and scale it to the board dimensions?
I used those as drilling templates...
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post #3 of 8
12/17/07 at 5:27am
Thread Starter 
Yes that can be done but I don't know how to do it. All my CADing experience has been achieved by trial and error. Im a student and I havent had any formal training on any software (Pro-E, Solidworks, Ansys, catia, etc). Figuring out how to do that in Solidworks might take some time and I was wondering of someone else already had CAD drawings with dimensions on them.
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post #4 of 8
12/17/07 at 8:25am
The mounting holes at the four corners are 0.129" diameter.

Turn the board so that the volume/bass boost pots point to your left and the V+/V- block to your right, so that the small M³ logo and version number is upright.

Now suppose that the bottom left corner of the board is the origin, then the top row of heatsink holes are at Y=3.9", while the bottom row of heatsink holes are at Y=2.9". The six heatsinks are centered at X=1.5", 2.5", 3.3" 4.3", 5.1" and 6.1" , respectively. All heatsink holes are 0.125" diameter (you should use imperial #4-40 or metric M3 screws).

Hope this helps.
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post #5 of 8
12/17/07 at 9:20am
...Your signature includes an M3...?

Its been a long time since I played with Solidworks but a common approach would be to xref the pdf file, then trace over the top...
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post #6 of 8
12/17/07 at 11:37am
If the PDF image was created from vector-based software, then you can load it into Adobe Illustrator and export directly into either a DXF or an AutoCAD DWG. It seemed to work OK for me - the fonts looked pretty weird in Illustrator, but it converted to DWG in good shape - appears to be to scale, too (in mm) .

I'd attach it, but you need to get permission from Amb. I'm not prepared to go that far without his concurrence.
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post #7 of 8
12/17/07 at 12:33pm
Thread Starter 
Quote:
Originally Posted by Daveze View Post
...Your signature includes an M3...?

Its been a long time since I played with Solidworks but a common approach would be to xref the pdf file, then trace over the top...
When I built the first chassis I didn't have access to milling equipment so I eyeballed the holes or marked them with a sharp object. I'd like to do something a little more precise this time.
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post #8 of 8
12/17/07 at 12:33pm
Thread Starter 
Thanks everyone, that helps a lot!
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