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Text File  |  1997-06-29  |  2KB  |  59 lines
  1. <html>
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  3. <head>
  4. <title>HwB: Active Filter: Butterworth 12dB Highpass</title>
  5. <meta name="Author" content="Joakim Ögren">
  6. <meta name="Description"
  7. content="Formulas for a 2nd order Butterworth active highpass filter.">
  8.  
  9. <meta name="Keywords"
  10. content="HwB, pinout, hardware, butterworth, filter, active, highpass, 2nd, 12">
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  18. link="#0000EE" vlink="#551A8B" alink="#FF0000">
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  21. <p align="center"><a href="menu_Misc.html"><img
  22. src="images/mini_Back.GIF" alt="GoTo Misc" border="0" width="64"
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  29. <h1>Active Filter: Butterworth<br>
  30. (2st order, 12 dB/octave, Highpass)</h1>
  31.  
  32. <p><img src="images/misc_ActiveFilter2H.GIF"
  33. alt="2nd order Butterworth Highpass" align="bottom" width="231"
  34. height="111"></p>
  35.  
  36. <p>C=4.7n-10nF<br>
  37. Ra=0.7071/(2*pi*Fc*C)<br>
  38. Rb=1.414/(2*pi*Fc*C)</p>
  39.  
  40. <p><font size="2"><i>Units: Rx [Ohm], C [F], Fc [Hz]</i></font></p>
  41.  
  42. <address>
  43.     <font size="2">Contributor: </font><a
  44.     href="mailto:qtech@mailhost.net"><font size="2">Joakim Ögren</font></a>
  45. </address>
  46.  
  47. <address>
  48.     <font size="2">Source: ?</font>
  49. </address>
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  51.  
  52. <address>
  53.     <font size="1">Please send any comments to </font><a
  54.     href="mailto:qtech@mailhost.net"><font size="1">Joakim Ögren</font></a><font
  55.     size="1">.</font>
  56. </address>
  57.  
  58. </body>
  59. </html>