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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
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Old 19th December 2017, 08:30 AM   #11
astx is offline astx  Austria
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Join Date: Jan 2011
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Very clean soldering!
One hint: first solder flat parts and last solder the highest parts.

Matching: I have matched them out of the whole batch for lowest Vbe and hFe difference. During matching with your DCA 75 pro all transistors should have the same temperature. e.g. Use a thick aluminium brick and let the transistor cool down after you have touched them. After measurement write down the number on the back side of the transistor so you can find the part after sorting your spread sheet.

Have fun, Toni
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Old 20th December 2017, 08:19 AM   #12
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Of course it would be very hard to write down a number on the small signal transistors...
I have used this little boxes to sort them by number.
You simply "scan" your sorted excel sheet for pairs and select them by number from the box.
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Old 9th February 2018, 08:20 AM   #13
astx is offline astx  Austria
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ASTX SA2014 Build Thread. 2 x 400W@4R with CNC machined case.
Dear Mark,

any update? Any help needed?

BR, Toni
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