Friday, 8 November 2013

R/C Low Pass filter (passive) cheat sheet


Cutt Off freq= 1 / ( π R C )


C =  33 nF; R = 220 R (Ohms); Cut-off freq.= 21.92 KHz
C = 150 nF; R = 100 R (Ohms); Cut-off freq.= 10.61 KHz
C = 150 nF; R =    1 K (Ohms);  Cutoff freq  = 1.06 KHz
C =  2.2 uF; R = 100 R (Ohms); Cut-off freq.= 723.43 Hz
C =   10 uF; R = 100 R (Ohms); Cut-off freq.= 159.15 Hz
C =   22 uF; R =   68 R (Ohms); Cut-off freq.=  106.39 Hz

* I tried to use some of the most common values for the Resistors and Capacitors; keep in mind this drops at +- 20 dB per octave   ( 2 f ).

C =  220 nF; R =    1 K (Ohms); Cut-off freq.=723.43











Graphs and simulations done with Falstad online sim


No comments:

Post a Comment

Feel free to contact me with any suggestions, doubts or requests.

Bless