A circuit diagram of a differentiating amplifier made using an operational amplifier.

${\displaystyle V_{\text{out}}=-RC\left({\frac {\operatorname {d} V_{\text{in}}}{\operatorname {d} t}}\right)\,\qquad {\text{where }}V_{\text{in}}{\text{ and }}V_{\text{out}}{\text{ are functions of time.}}}$