It should not do so. The purpose of using an op amp as a mixer is to isolate
the channels through the virtual ground (pin 2 of the LM358s are a virtual
ground).
Any variation is likely to be caused by a lack of a good ground connection
between the bottom of the pots and the 0v line of the PCB. Also check the
earth connections of the jacks.
Ken
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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the channels through the virtual ground (pin 2 of the LM358s are a virtual
ground).
Any variation is likely to be caused by a lack of a good ground connection
between the bottom of the pots and the 0v line of the PCB. Also check the
earth connections of the jacks.
Ken
>With the CV mega mixer, i've noticed the volume of an input effects_______________________________________________________________________
>the volume of other channels, and also seems to throw off the zero
>point of the pots. Anyone encountered this? Is this a trait of simple
>unity gain summing amplifier circuits? (I've yet to build one from
>scratch).
>Thanks, daryl
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>