Transistor matching - my results

[Roy Tate]

Here's my second shot at using the Moog transistor matching
schematic.  After changing the schematic (I had a jumper to V+ 
that should have been V-) I started getting results in line with the
0.6xx mentioned in the paper.  I also switched to a 1 amp +/-15 V 
power supply.  Here is the test data for my first matching session on 
17 NPN 3904s:

1 x 0.5942
1 x 0.6013
1 x 0.6060
2 x 0.6064
1 x 0.6067
2 x 0.6070
1 x 0.6086
1 x 0.6110
4 x 0.6127
1 x 0.6128
1 x 0.6134
1 x 0.6136

The paper says that a match is +/-0.002 V or 2 mV, so I have several
close matches as well as a few very good matches.

BTW, as before I was using a Fluke 8060A digital meter.  I think it's
working now.  I've toyed with the idea of taking readings in a heated
room and getting the slope for curiosity, but who knows.  BTW, some
digital volt meters have hfe measurements, using 3V and a few milliamps,
would their measurements be significantly better than what I'm doing?
And a special thanks to Magnus Danielson for keeping me honest.  :)

Peace,

Roy Tate
roytate at ionet.net