[sdiy] SMT noise generation?

[houshu at muj.biglobe.ne.jp]

Hello Joe and List,

TL431 can generate quite stable good noise.
I tested 3 makers and the amplitude was always around 50mVpp
for 5V Vcc.

http://houshu.at.webry.info/200901/article_1.html
http://houshu.at.webry.info/200912/article_1.html

Using an SMT TL431 (and an amplifier) may be the simplest solution.

Sam HOSHUYAMA
Saitama, JAPAN

----------
From: "Joe Grisso" <jgrisso at det3.net>

Hello all,

     I've got an analog noise generator design I'm fleshing out, and
hit a bit of a wall. I'm reaching out to do a sanity check since my
discrete engineering expertise is a wee bit rusty. The simple question
goes: If I have a TO-92 BC547 and replace it with a SOT-23 BC847,
since they are the same part and have the same parameters, would that
mean they would generate the same amount of noise? Part of me says yes
because all the other parameters (Hfe, Vce, Ic, etc) line up, but
another part of me says that since it's in a smaller package and may
use less material to achieve those properties that there would be less
noise. Could anyone clear this up for me?

Best,

-- 
Joe Grisso
Detachment 3, Ltd.
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