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 Forum index » Instruments and Equipment » General Discussion
Transistor matching
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Wobuse



Joined: Dec 07, 2011
Posts: 28
Location: Lyons,il

PostPosted: Tue May 21, 2013 3:13 pm    Post subject: Transistor matching
Subject description: kinda a follow up on an earlier post
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I spend the last couple of days getting up to speed with transistor matching.
I bought a used Fluke 8842a Multimeter ,& put together Ian Fritz"s transistor matching circuit....http://home.comcast.net/~ijfritz/projects/transmat001.pdf
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I added a switch to select between PNP & NPN testing,an LED as a power indicator. & a switch to reverse the emitters,for error correction.
Decoration ,compliments of my eight year old daughter ..
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I estimate an error of about .0080, between both sides ,so half of that is .0040 , which should be deducted(I think) from the measurement shown.
Above is a MAT02...under test....this is a high water mark :for sure !

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Here is an LM394... still pretty awesome ...

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Here are two of the best matched 2N3904's...Pretty darn good ,I must say..well under the 2mv most applications demand.


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Here is a little color coding scheme i came up with... Silver is under 1mv mismatch..silver with a bronze stripe is under .5mv mismatch..
gold is under .05 mismatch.

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