MS20 Filter capacitor values

[Paul R. Higgins]

>If they are .002uF, you should use 2200nF not 2200 pF. If you used 2200pF the 
>cutoff frequency will be much higher than desired.  

No.  Remember from physics class, "micro-" = 1 x 10^-6, "nano-" = 1 x 10^-9, and
"pico-" = 1 x 10^-12.  Therefore 0.002 uF = 0.002 x 10^-6 = 2 x 10^-9 = 2 nF.  
The value of 2200 pF is approximately equal to 2 nF (or 0.002 uF), here's the 
math:

2200 pF = 2200 x 10^-12 = 2.2 x 10^-9 = 2.2 nF (which also equals 0.0022 uF).

So the value of 2200 pF is pretty close to 0.002 uF.  "Close enough for rock 'n 
roll", as they say.  

Incidentally, 2200 nF = 2200 x 10^-9 = 2.2 x 10^-6 = 2.2 uF!  This is 1000x 
greater value than 2200 pF.  

Hope this helps.

PRH


Paul Higgins
email: higg0008 at tc.umn.edu
University College, University of Minnesota