[sdiy] Which opamp pins wiring is best for CV out ?? A or B ??

[Harry Bissell]

I think this was discussed in a recent thread but I forget what the title might have been...

I like "a" because it puts the resistor between the opamp inverting input
and the real world, but it will have an error based on the value of the output
resistor and the input impedance of whatever you are driving...

Others did not agree...

H^) harry


----- Original Message -----
From: Jean-Pierre Desrochers <jpdesroc at oricom.ca>
To: synth-diy at dropmix.xs4all.nl
Sent: Mon, 08 Nov 2010 14:32:32 -0500 (EST)
Subject: [sdiy] Which opamp pins wiring is best for CV out ?? A or B ??



Which opamp pins wiring is best for CV out ?? A or B ??
Sorry for the bad drawing... no HTML so.
I'm in the CV out design of my sequencer and
I need so much your thoughts on that.

A:
          
              |\
              | \ 
              |  \ 
              |   \ 
              |    \ 
              |     \ 
 incoming CV  |  |   \ 
--------------| ---   \ 
              |  |     \_____/\/\/\____ CV OUT
              |        / | 
              |       /  | 
              |      /   | 
          ----| --- /    | 
          |   |    /     | 
          |   |   /      | 
          |   |  /       | 
          |   | /        | 
          |   |/         | 
          |   |          |
          |              | 
          |--------------| 
          
          B:
           
              |\
              | \ 
              |  \ 
              |   \ 
              |    \ 
              |     \ 
 incoming CV  |  |   \ 
--------------| ---   \ 
              |  |     \_____/\/\/\__ __ CV OUT
              |        /             |  
              |       /              |  
              |      /               |  
          ----| --- /                |  
          |   |    /                 |  
          |   |   /                  |  
          |   |  /                   |  
          |   | /                    |  
          |   |/                     |  
          |   |                      |  
          |                          |  
          |--------------------------|
          
Thanks
J-P
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-- 
Harry Bissell & Nora Abdullah 4eva