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<body class='hmmessage'><div dir='ltr'>What is the method of performing the matching checks using an analog or digital meter & what readings should I look for on each one since I have some 2N3904's & 2N3906's.<br><br>Logan<br><br>> From: Matthias.Herrmann@jeppesen.com<br>> To: davebr@modularsynthesis.com; synth-diy@dropmix.xs4all.nl<br>> Date: Wed, 8 Jun 2016 09:18:26 +0200<br>> Subject: Re: [sdiy] 2n3904 transistor matching stats<br>> <br>> That's exactly what I experienced over the last years, however, I did no statistics.<br>> So thank you for verifying.<br>> <br>> Cheers,<br>> Matthias<br>> <br>> > From: Synth-diy [mailto:synth-diy-bounces@dropmix.xs4all.nl] On Behalf Of<br>> > Dave Brown<br>> > Sent: Wednesday, June 08, 2016 7:43 AM<br>> > To: 'synthdiy diy' <synth-diy@dropmix.xs4all.nl><br>> > Subject: Re: [sdiy] 2n3904 transistor matching stats<br>> > <br>> > I just built a design for a customer that needed 6 matched pair of 2N3906s. I<br>> > bought them on cut tape and verified matching with my 577 curve tracer. I<br>> > was literally unable to tell any difference between adjacent pairs. Then I<br>> > tested the 1st on the cut tape against the 12th and I could detect a very<br>> > minor difference. I was impressed.<br>> > <br>> > Then I tested a random batch of loose transistors of another type. There<br>> > were more significant differences but it seemed like a Gaussian distribution<br>> > with many close in characteristics and a few outliers. It was much tighter<br>> > than I expected, but for all I know they came out of the same batch as they<br>> > were not a high volume runner.<br>> > <br>> > Dave<br>> > <br>> _______________________________________________<br>> Synth-diy mailing list<br>> Synth-diy@dropmix.xs4all.nl<br>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy<br> </div></body>
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