I heard a Feynman anecdote (this one is supposedly true) that has Dr.
Feynman teaching an intro physics class and he writes an equation on the
board. He leaves off the 2*Pi factor but a student catches his mistake. Dr.
Feynman does this 3 or 4 times and each time the same kid corrects him. He
is rewriting the equation and as soon as he hears "Dr. Feynman....." from
the class he says "F*ck the 2 Pi" without looking.
 Maybe that should be OT? But I just physics class anecdotes.
 James

 On 10/11/05, Michael Hagen <picdog@dslextreme.com> wrote:
>
> 1/2PiRC =3D 0.159/RC Try it for the hipass!
>
> ----- Original Message -----
> From: "Julio Jumpa" <julio.jumpa@gmail.com>
> To: <piclist@mit.edu>
> Sent: Monday, October 10, 2005 11:24 PM
> Subject: [EE] Filter question
>
>
> Hello,
>
> I need to build an amplifier very similar to this one i found in a book
> (Webster, 1995)
> http://img111.imagevenue.com/img.php?loc=3Dloc256&image=3Dc55_webster.jpg
>
> Mine needs to have a BW (-3dB) from 0.05 to 500Hz.
>
> According to this book design, the 1uF and 3,3M resistor forms a high pas=
s
> filter at 0.05Hz, but 1/RC =3D 0.3Hz.
>
> Also, the low pass filter after that (150K and 0.01uF) is said to be at
> 100Hz, but 1/RC =3D 667Hz.
>
> Am I getting something wrong?
>
> Thanks
> Julio
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