Re: Lo-pass calc

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Blake by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tb3-at-att-dot-net>

Hi Greg,

Don't for get your 2 PI (approx. 6.28).

F= 1/(2 x PI x RC)

where F is the -3dB frequency in Hz, R
is Ohms, and C is capacitance in Farads.

Terry Blake
Happy Holidays
http://www.tb3-dot-com/



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 29, 2002 9:46 PM
Subject: Lo-pass calc


 > Original poster: "Gregory Hunter by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
 >
 > How do I calculate the -3dB point for an RC lo-pass
 > filter? I've dug through my old ARRL book, but I can't
 > find it. Maybe it was never in there! By memory I'm
 > using F = 1/RC where F is the -3dB frequency in Hz, R
 > is Ohms, and C is capacitance in Farads. Am I thinking
 > right?
 >
 > Happy New Year,
 >
 > =====
 > Gregory R. Hunter
 >
 > http://hot-streamer-dot-com/greg
 >
 >
 >