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Text File  |  1997-11-23  |  2KB  |  58 lines
  1. <html>
  2.  
  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">
  11.  
  12.  
  13. </head>
  14.  
  15. <body stylesrc="menu_Circuit_Top.html"
  16. background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
  17. link="#0000EE" vlink="#551A8B" alink="#FF0000">
  18.  
  19.  
  20. <p align="center"><a href="menu_Circuit.html"><img
  21. src="images/mini_Back.gif" alt="GoTo Circuit" border="0"
  22. width="64" height="48"></a><img src="images/menu_Circuit.gif"
  23. alt="CIRCUIT" width="400" height="48"><a href="hwb.html"><img
  24. src="images/mini_HwB.gif" alt="GoTo Main" border="0" width="64"
  25. height="48"></a></p>
  26.  
  27.  
  28. <h1>Active Filter: Butterworth<br>
  29. (2st order, 12 dB/octave, Highpass)</h1>
  30.  
  31. <p><img src="images/cir_ActiveFilter2H.gif"
  32. alt="2nd order Butterworth Highpass" align="bottom" width="231"
  33. height="111"></p>
  34.  
  35. <p>C=4.7n-10nF<br>
  36. Ra=0.7071/(2*pi*Fc*C)<br>
  37. Rb=1.414/(2*pi*Fc*C)</p>
  38.  
  39. <p><font size="2"><i>Units: Rx [Ohm], C [F], Fc [Hz]</i></font></p>
  40.  
  41. <address>
  42.     <font size="2">Contributor: </font><a
  43.     href="menu_Comment.html"><font size="2">Joakim Ögren</font></a>
  44. </address>
  45.  
  46. <address>
  47.     <font size="2">Source: ?</font>
  48. </address>
  49.  
  50.  
  51. <address>
  52.     <font size="1">Please send any comments to </font><a
  53.     href="menu_Comment.html"><font size="1">Joakim Ögren</font></a><font
  54.     size="1">.</font>
  55. </address>
  56.  
  57. </body>
  58. </html>