You might also want to read the sections to the left before the averager and summer section to better understand how an op-amp works and how to set the gain. -Jacob
The reason why I bash RS salespeople is their company chooses NOT to educate the employees. There are consumer electronics corporations that do and it is a great thing to see. If you come around my part of the country, walk into a Magnolia Hi-Fi and be amazed...
ok, in the diagram on page "http://www.allaboutcircuits.com/vol_3/chpt_8/8.html " under the section about "noninverting summer circuit" there is a value for R that is equal, and placed on all 3 of the input voltages.
Can this resistance value be anything, such as nothing?
If not, How can I calculate an appropriate resistance for this value?