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Text File  |  1997-06-29  |  2KB  |  60 lines
  1. <html>
  2.  
  3. <head>
  4. <title>HwB: Active Filter: Butterworth 18dB Highpass</title>
  5. <meta name="Author" content="Joakim Ögren">
  6. <meta name="Description"
  7. content="Formulas for a 3rd order Butterworth active highpass filter.">
  8.  
  9. <meta name="Keywords"
  10. content="HwB, pinout, hardware, butterworth, filter, active, highpass, 3rd, 18">
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  18. link="#0000EE" vlink="#551A8B" alink="#FF0000">
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  27.  
  28.  
  29. <h1>Active Filter: Butterworth<br>
  30. (3st order, 18 dB/octave, Highpass)</h1>
  31.  
  32. <p><img src="images/misc_ActiveFilter3H.GIF"
  33. alt="3rd order Butterworth Highpass" align="bottom" width="331"
  34. height="121"></p>
  35.  
  36. <p>C=4.7n-10nF<br>
  37. Ra=0.500/(2*pi*Fc*C)<br>
  38. Rb=2.000/(2*pi*Fc*C)<br>
  39. Rc=1.000/(2*pi*Fc*C)</p>
  40.  
  41. <p><font size="2"><i>Units: Rx [Ohm], C [F], Fc [Hz]</i></font></p>
  42.  
  43. <address>
  44.     <font size="2">Contributor: </font><a
  45.     href="mailto:qtech@mailhost.net"><font size="2">Joakim Ögren</font></a>
  46. </address>
  47.  
  48. <address>
  49.     <font size="2">Source: ?</font>
  50. </address>
  51.  
  52.  
  53. <address>
  54.     <font size="1">Please send any comments to </font><a
  55.     href="mailto:qtech@mailhost.net"><font size="1">Joakim Ögren</font></a><font
  56.     size="1">.</font>
  57. </address>
  58.  
  59. </body>
  60. </html>