Hi Hüseyin Yalçin, Many of your cap values are incorrect, see the recommendations from the datasheet as shown below The OPA735 looks like it has +5V nets on both supplies, which obviously will not work. Why not use something like LM27762: this devices takes a single supply voltage and generates a stepped down, clean bipolar output. So for example you can apply 5V to VIN and then get +/-2.5V on the output. This makes the most since because you will already have to generate a bipolar supply for the OPA735 in your existing circuit. Why not just remove the REF + buffer + inverting amp and just use a single, simple device to generate your supplies? -Bryan
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