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Amiga MA Magazine 1998 #7
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mi_activefilterbutterworth4h.h
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1997-03-07
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<html>
<head>
<title>HwB: Active Filter: Butterworth 24dB Highpass</title>
<meta name="Author" content="Joakim Ögren">
<meta name="Description"
content="Formulas for a 4th order Butterworth active highpass filter.">
<meta name="Keywords"
content="HwB, pinout, hardware, butterworth, filter, active, highpass, 4th, 24">
</head>
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background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
link="#0000EE" vlink="#551A8B" alink="#FF0000">
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src="images/mini_Back.GIF" alt="GoTo Misc" border="0" width="64"
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<h1>Active Filter: Butterworth<br>
(4th order, 24 dB/octave, Highpass)</h1>
<p><img src="images/misc_ActiveFilter4H.GIF"
alt="4th order Butterworth Highpass" align="bottom" width="371"
height="121"></p>
<p>C=4.7n-10nF<br>
Ra=0.9239/(2*pi*Fc*C)<br>
Rb=1.0824/(2*pi*Fc*C)<br>
Rc=0.3827/(2*pi*Fc*C)<br>
Rd=2.6130/(2*pi*Fc*C)</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>