Hi MrAl, others,
Yes I didnt think of the obvious - that is just using a simple resistive divider to attenuate first.
I calculate the top resistor to be 90.9k.
I still have a problem though.. as can be seen from the sim and trace below:
View attachment 61913
The blue trace is the signal attenuated using the resistive divider. The red trace is the output from the op-amp. Yes its inverted however its swinging from 0 to negative 2.7volts.
Also I am using a -15volts as the negative input for the op-amp...
How do I move the output so it touches ground or 0 at its lowest point and..... is it possible to do this without resorting to a negative rail... rather use ground as the negative pin for the op-amp?
Cheers
Simon