Awesome thanks for all your help much appreciated

 

You´re welcome, please do come back with the results when you build it

 

Hi

I managed to get an output of +/- 68mV i think that's close enough just curious as to why the 22pF capacitor made such a huge impact on the circuit.


thanks

 

Where did the schematic go?
Anyway, the 22p is there just to lower the gain at frequencies above 100kHz and to make sure the opamp doesn´t oscillate on its own. Without it the circuit might work anyway, but probably not with high speed opamps which can be quite finicky about this an proper power supply decoupling.
The main problem was that the C3 and C4 had close values, which made a kind of another "gain setting resistor pair" but for AC signal, thus changing the gain above the 900Hz.