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Message ID: 490     Entry time: Thu Feb 10 16:45:32 2011
Author: Frank 
Type: Summary 
Category: Electronics Equipment 
Subject: ultra low-noise pre-amps 

some old designs i've built some years ago using the cheaper DIP versions of the matched BJT pairs from Analog Devices.

Designs are DC-coupled, gain 1000 as they were designed for measuring the noise of photodetectors.
Given values are not 100% what i've used later, only for drawing the schmatics (e.g. gain setting resistors or compensation), but order of magnitude is right.

Eagle-files + Documentation:

uln-amp_NPN_v1.brd

uln-amp_NPN_v1.sch

uln-amp_PNP_v1.brd

uln-amp_PNP_v1.sch

uln-amp_NPN_v1.documentation.pdf

uln-amp_PNP_v1.documentation.pdf

BJT_preamp_inputnoise.png

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