User:DanBealeCocks/Analog adder

http://www.physics.ubc.ca/~phys209/analogue_comp.pdf http://www.play-hookey.com/analog/

An analog adder, often called analog summer to differentiate from digital adders, sums the voltages at its inputs, and provides that voltage at its output. They are commonly made using Op Amps. Analog adders are used as part of analog computers.

make a diag (easy and clear)

wikilink analog, op amps, and analog computers.