[sdiy] double transistors

[Happy Harry]

NO...

Devices like the 2SC1583, MAT-01,02,03,04, LM394 are fabricated
on the same substrate. They are more than just selected transistors
in a common package. These are "matched" transistors. The 3046 is usually 
pretty well matched because of the common substrate, though it is loosly 
spec'd.

The others are just "dual" transistors. They may have been matched
or not.

For good expo converter performance, use monolythic pairs like the
2SC1583,....

H^) harry



>From: "Christian Sandgaard Thuesen" <uhu at worldonline.dk>
>To: "MountainMan" <mtman at cloud9.net>
>CC: "SDIY" <synth-diy at node12b53.a2000.nl>
>Subject: RE: [sdiy] double transistors
>Date: Sun, 5 Apr 1998 18:32:59 +0200
>
>Matching transistors is simply 2 transistors made in the same house with 
>the
>same Hfe (how much the current is amplified from Basis to Emitter). Making
>them in the same house also prevent different temperatures exposed to the 2
>transistors, which helps them to amplifie? the same amount, very helpful in
>differential amplifiers or similar situations where linear operation is
>required. In other words: it is like 1 transistor but is 2!
>
>Christian T, the guy with a CMU-800R.
>
>

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