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OPamp "summing" question

5/18/2000 5:28 AM
Ed Rembold	OPamp "summing" question Vetrans, which is most preferable when "summing" or "mixing" with an opamp- The (-)inverting, or (+)noninverting input? Every mixing schem. I've seen uses the (-) input, (but I think this is because the circut adapts to "gain" adjusting easier, via pots or resistors) If you just wish to "re-combine" equal amplitude, and phase, signals- Does it matter? I hope this is clear enough. Thanks in advance, Ed R.

5/18/2000 5:28 AM

Ed Rembold

OPamp "summing" question

Vetrans,
which is most preferable when "summing" or
"mixing" with an opamp- The (-)inverting, or
(+)noninverting input?
Every mixing schem. I've seen uses the (-)
input, (but I think this is because the circut
adapts to "gain" adjusting easier, via pots or
resistors)
If you just wish to "re-combine" equal
amplitude, and phase, signals- Does it matter?
I hope this is clear enough.
Thanks in advance, Ed R.

Replies:

Reverb Ed,The "Best Way" o... -- 5/18/2000 7:33 AM
paul perry This is treated well in Boscorelli'... -- 5/18/2000 1:27 PM
peter there is a reason why the inverting... -- 5/18/2000 2:54 PM
Joe Fuzz Ed: the inverting and non-inverting... -- 5/18/2000 4:23 PM