PSN-L Email List Message

Subject: Amplifier Noise
From: Chuck / Judy Burch cjburch@...........
Date: Sun, 07 Jul 2013 09:27:18 -0600

I have had poor results using switch mode power supplies.  I started 
using them since they were easily available from dead PCs.  But it is 
next to impossible to reduce their noise to acceptable levels.

Always bypass rails at each op amp with 0.1 uF cap and placing a few 100 
to 1000 uF electrolytics in strategic places can help too.

Building linear power supplies is easy, especially if you can find a few 
junk power transformers.  (Many thrift shops just throw out electronics 
that don't work.)  The data sheets for the LM317 and LM337 have all the 
information you need.

Download "Op Amp Applications" by Walt Jung from the Analog Devices 
website.  It will answer your questions.


Chuck Burch

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