DC 5v to -5v flipflop with arduino and OPamp.

Maybe I’m misunderstanding your intention but the reason this circuit works is because the opamps in this circuit have negative voltage rails that can output the +/-5V for the Arduino board. The default opamp configuration in EveryCircuit is with power rails of +/-15V meaning that is the range it’s output can go before clipping will occur. If the opamp is powered by the same 5V source as the Arduino board is then the power supply for the opamps need to be changed to 0V-5V which causes the circuit to stop working. Also if the opamps *do* have power rails that reach +/-5V you can use one clock output pin from the Arduino with one inverting amplifier to generate a +/-5V output. My interpretation reading the description sounded like you could just connect an opamp to your Arduino board and it’ll make +/-5V easy when more consideration would be needed to actually make it work.