> Can I boost the CGS116 output by changing a resistor or something?
> Ideally I need it to output 10vpp.
R7 and R8 are configured as a simple inverting amplifier, and the gain
in this type of setup is R8/R7. Meaning the gain in this case is set
slightly above 1. You should be able to increase the gain 2 to get
your desired effect. You do this by making R8/R7 equal a little above
2. For example by replacing R8 with a 100k.
Two potential problems, however.
1) You might be hitting the limits of the opamp because 10 V might be
too close to the positive rail. I can't be bothered to check this for
this opamp, but you should be able to find this information in the
datasheet.
2) The output of U1 isn't just simply used as an output, but also
feeds back into U4. What is U4? It acts as a comparator, which reacts
when the output goes above +5V, probably to detect when the peak of
the attack/decay phase has been reached. Since it will still react to
+5V while the output is now doubled, something (not sure what) won't
work as it should. You should be able to fix this by adding a resistor
between pin 12 of U4 and ground to form a voltage divider which will
attenuate the voltage that U4 sees back to +5V-ish. Maybe the
appropriate value is 82k, just like R35a, maybe you need a different
value there. The reason why you might want a different value is
because R35a might in itself be designed to form a voltage divider
with the bottom resistor being the input impedance of the input of pin
12 U4.
Good luck!
--
/Ove
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