Circuit Simulation for a circuit that take a 10KHz input
I'm not sure what you mean by that last part:


  Choose resistor and capacitor values such that approximately two-time constants have elapsed.


Anyways, is this smooth enough for you?



Here's the netlist:

V1 N001 0 PULSE(0 1 0 0 0 50u 100u)
C1 N003 0 1µ
R3 N002 N003 1k
C2 N002 0 1µ
R1 N001 N002 1k
.tran 0 5.001 5 10u
.backanno
.end