The scaling feature of the inverting opamp summer you have mentioned is a handy thing to recognize.I notice that in that section, the description of the equations for an inverting summing amplifier are not very robust. V1, V2, and V3 can each be scaled independently of one another, given by the equation:
Vout = (-Rf/R1)V1 + (-Rf/R2)V2 + (-Rf/R3)V3, where Rf is the feedback resistor.
That handy information is not apparent in the article.
by Aaron Carman
by Aaron Carman
by Jake Hertz