XPost: alt.engineering.electrical, sci.electronics.design, sci.e   
   ectronics.repair   
   From: invalid@invalid.net   
      
   > I'd eliminate C9.  Some op amps aren't able to drive capacitive loads   
   > without exhibiting instability.   
      
   OK, done.   
      
   > If you're using a good low-noise op amp,   
   > you can probably just omit the filtering here and feed U4's output   
   > directly to your "common".   
   >   
   > I'd also recommend decoupling your 16-volt power supply, with a .1 uF   
   > located as close as practical to the V+/V- pins of each op amp.   
      
   Sound like basic good advice. :-)   
      
   > Remember to get the polarities of C1-C7 correct when you install them   
   > (+ to the op-amp side, - to the outside world).   
      
   I presumed that such coupling caps should be non-polar. No?   
      
   Thanks.   
      
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