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dsolodov  
#1 Posted : Thursday, April 2, 2015 3:21:47 AM(UTC)
dsolodov

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Hi:

What's the best way to utilize a set of measured transistors for QP1-12 in Legato 3.1? I measured Vgs on a small set of TP0604 (Fluke 287, -12V through 150R 5W resistors sourced from by a DP832A). The set is sorted by Vgs. I think of using (7,6,25,2,13,4) for QP1-QP6 and (12,18,23,10,24,1) for QP7-QP12. Is there a better way to use the measured parts for the build?

ID Vgs

17 2.2619
22 2.2684
8 2.2685
3 2.2693
5 2.2739
19 2.2769
15 2.2795
16 2.2798
7 2.2912
6 2.2927
25 2.2927
2 2.2938
13 2.294
4 2.2946

11 2.3075
14 2.3105
21 2.3168
20 2.3426
12 2.3602
18 2.3635
23 2.3637
10 2.3639
24 2.3661
1 2.3771

9 2.3839

avr300  
#2 Posted : Sunday, April 5, 2015 8:26:17 AM(UTC)
avr300

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Look (more than) fine to me.

Remember - the original kit doesn't include hand selected FET's (not that I aware of, Brian may correct me).

And that unselected version is playing nicely right here, right now ;-)
Russ White  
#3 Posted : Thursday, April 9, 2015 7:04:35 PM(UTC)
Russ White

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Matching is actually not all that critical - but it may help a tiny bit. :) The reason is two fold - the FETs are in parallel - and it is a differential signal with no feedback.
dsolodov  
#4 Posted : Saturday, April 11, 2015 3:39:34 AM(UTC)
dsolodov

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Thank you for the responses!
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