Quote:
Originally Posted by ugrnm
What could go wrong if I mess around with R335/R325? Bare in mind I'm very new to electronics so I may not see the bigger picture.
My intention is to make a simple mod to have a higher signal output to plug the Amiga on a mixer where all the other devices are much louder (pro line level vs consumer line level of the graph I posted in the first message). Said differently, I'd like to have the A600 send something around 3.4V. Currently it generates 1.7V.
That's why I thought to achieve this by altering the last voltage divider.
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Hi,
My apologies, I've treated this circuit like a typical precision op-amp circuit when I did not need to. To boost the output change R325 and R335 from 390R to either 470R or 510R. This will get you a peak voltage of 0.9408V for 470R resistor or 0.9702V for 510R. You won't get the exact 1.095V reading due to the 5% tolerance of components used on the Amiga.
You need some 1206 510R (or 470R resistors) 1%. Ebay are pricey for a few resistors but if that is all you need, it's not worth using a regular distributor with their postage costs.
Good luck.