This is the circuit schematic of an astable multivibrator. I have to chose the resistance value of R3 in order to limit the output current of the OpAmp. The OpAmp model is TL081 Texas Instruments, and this is the link to its datasheet . I am not able to find any information about the maximum output current in it. Can anyone help me? I have another question: is there any other reason why the resistor R3 is necessary in this circuit ?