A differentiator circuit can be used to convert a pulse input to a nearly constant dc output.

The steady-state condition of an integrator is reached after 5 time constants regardless of the number of input pulses that occur in that amount of time.

If a repetitive-pulse waveform is applied to an RC integrator, the output waveshape depends on the relationship of the circuit time constant and the duty cycle of the input pulses.

The output voltage of a differentiator goes negative on the falling edge of the input pulse.

The voltage across a capacitor in an RC integrator circuit cannot change exponentially; it can change only instantaneously.