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Old 27th January 2012, 10:18 AM   #4921
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They are right around the corner...
http://www.aquacut-solingen.de/
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Last edited by Benedetto; 27th January 2012 at 10:21 AM.
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Old 27th January 2012, 10:59 AM   #4922
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by MiiB View Post
A little unit like this....could do the trick...can be cut with waterjet, glass blasted and anodized to a nice finish...would look good...
Made of copper (optional gold )
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Old 27th January 2012, 11:07 AM   #4923
MiiB is online now MiiB  Denmark
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Copper/brass/bronze would be very fine materials. I don't fancy aluminium for heat-sinks, as it is para-magnetic. profound difference in sound where aluminium is not used. I know this here is small currents compared to an output-stage of an power amplifier.. but anyway
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Old 27th January 2012, 11:09 AM   #4924
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Hi Frans;
Al:204W/mxK
Gold:310W/mxK
Copper:384W/mxK
Silver:407W/mxK

I do prefer Copper anyway.
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Old 27th January 2012, 11:11 AM   #4925
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But i've got a little stock of CuSn too....
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Old 27th January 2012, 11:23 AM   #4926
hesener is offline hesener  Germany
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Here is a drawing of the dimensions. All in mm.

I have added two flanges where the thing may be fixed on the PCB. This would accept a 30x30mm heatsink on top of it quite nicely, aluminum or other (silver?). Not sure its needed though, some thermal grease to make good contact is probably enough.

Have measured a few different TO92's in the lab, and they all are between 4.58...4.63 in diameter where the belly is the widest ;-)
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Last edited by hesener; 27th January 2012 at 11:24 AM. Reason: more data
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Old 27th January 2012, 11:48 AM   #4927
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Sorry Alfred,
by looking to the pictures of the Boards
i'm in doubt your drawing is correct.
5mm thick should be good ?
I'll go for CuSn bronce.
Should we do the mounting holes with M3 threads ?
Will there be screwholes in the final boards ?
Or shold the 24Q-legs be strong enuff ?
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Old 27th January 2012, 11:50 AM   #4928
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I might be wrong 'cause technology is evolving each year but waterjet may be not up to the task...also money wise it may be cheaper to use CNC for these small details.

Anyone have any experience with cutting small details? I did only big stuff with waterjet, the last time I checked it was tricky to cut holes smaller than depth of the given alloy of such small diameter.
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Old 27th January 2012, 11:57 AM   #4929
hesener is offline hesener  Germany
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Quote:
Originally Posted by Benedetto View Post
Sorry Alfred,
by looking to the pictures of the Boards
i'm in doubt your drawing is correct.
5mm thick should be good ?
I'll go for CuSn bronce.
Should we do the mounting holes with M3 threads ?
Will there be screwholes in the final boards ?
Or shold the 24Q-legs be strong enuff ?
Hi Benedetto, I have taken the dimensions from the PCB layout tool (in mil) and converted to mm, that is why there are some strange values. The drawing is not to scale, but the dimensions should be correct. The legs of the transistors are somewhat bendable so it doesnt have to be super-precise. I would prefer to not rely on the transistor legs to hold it, thats not good for reliability purposes (solder joints should not see mechanical stress, thats a no-no in power electronics).

5mm thickness should be good enough. Right now there are no screw-holes in the boards but they can be added. The places I suggested would fit with the wiring on the PCB, only groundplanes there. Threads in the holes would be great, and with 5mm there should be enough metal for good holding.
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Old 27th January 2012, 12:06 PM   #4930
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Thax A.
Next week we'll get a pair or two protos.
CNC-milled.
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