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mi_activefilterbutterworth2l.h
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1997-06-29
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<html>
<head>
<title>HwB: Active Filter: Butterworth 12dB Lowpass</title>
<meta name="Author" content="Joakim Ögren">
<meta name="Description"
content="Formulas for a 2nd order Butterworth active lowpass filter.">
<meta name="Keywords"
content="HwB, pinout, hardware, butterworth, filter, active, lowpass, 2nd, 12">
</head>
<body stylesrc="menu_Misc_Top.html"
background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
link="#0000EE" vlink="#551A8B" alink="#FF0000">
<p align="center"><a href="menu_Misc.html"><img
src="images/mini_Back.GIF" alt="GoTo Misc" border="0" width="64"
height="48"></a><img src="images/menu_Misc.GIF" alt="MISC"
width="400" height="48"><a href="hwb.html"><img
src="images/mini_hwb.GIF" alt="GoTo Main" border="0" width="64"
height="48"></a></p>
<h1>Active Filter: Butterworth<br>
(2nd order, 12 dB/octave, Lowpass)</h1>
<p><img src="images/misc_ActiveFilter2L.GIF"
alt="2nd order Butterworth Lowpass" align="bottom" width="231"
height="111"></p>
<p>R=4.7k-10 kOhm<br>
Ca=1.414/(2*pi*Fc*R)<br>
Cb=0.7071/(2*pi*Fc*R)</p>
<p><font size="2"><i>Units: R [Ohm], Cx [F], Fc [Hz]</i></font></p>
<address>
<font size="2">Contributor: </font><a
href="mailto:qtech@mailhost.net"><font size="2">Joakim Ögren</font></a>
</address>
<address>
<font size="2">Source: ?</font>
</address>
<address>
<font size="1">Please send any comments to </font><a
href="mailto:qtech@mailhost.net"><font size="1">Joakim Ögren</font></a><font
size="1">.</font>
</address>
</body>
</html>