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Text File  |  1997-06-29  |  2KB  |  58 lines
  1. <html>
  2.  
  3. <head>
  4. <title>HwB: Active Filter: Butterworth 6dB Highpass</title>
  5. <meta name="Author" content="Joakim Ögren">
  6. <meta name="Description"
  7. content="Formulas for a 1st order Butterworth active highpass filter.">
  8.  
  9. <meta name="Keywords"
  10. content="HwB, pinout, hardware, butterworth, filter, active, highpass, 1st, 6">
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  14. </head>
  15.  
  16. <body stylesrc="menu_Misc_Top.html"
  17. background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
  18. link="#0000EE" vlink="#551A8B" alink="#FF0000">
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  20.  
  21. <p align="center"><a href="menu_Misc.html"><img
  22. src="images/mini_Back.GIF" alt="GoTo Misc" border="0" width="64"
  23. height="48"></a><img src="images/menu_Misc.GIF" alt="MISC"
  24. width="400" height="48"><a href="hwb.html"><img
  25. src="images/mini_hwb.GIF" alt="GoTo Main" border="0" width="64"
  26. height="48"></a></p>
  27.  
  28.  
  29. <h1>Active Filter: Butterworth<br>
  30. (1st order, 6 dB/octave, Highpass)</h1>
  31.  
  32. <p><img src="images/misc_ActiveFilter1H.GIF"
  33. alt="1st order Butterworth Highpass" align="bottom" width="191"
  34. height="111"></p>
  35.  
  36. <p>C=4.7n-10nF<br>
  37. R=1.000/(2*pi*Fc*C)</p>
  38.  
  39. <p><font size="2"><i>Units: R [Ohm], C [F], Fc [Hz]</i></font></p>
  40.  
  41. <address>
  42.     <font size="2">Contributor: </font><a
  43.     href="mailto:qtech@mailhost.net"><font size="2">Joakim Ögren</font></a>
  44. </address>
  45.  
  46. <address>
  47.     <font size="2">Source: ?</font>
  48. </address>
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  50.  
  51. <address>
  52.     <font size="1">Please send any comments to </font><a
  53.     href="mailto:qtech@mailhost.net"><font size="1">Joakim Ögren</font></a><font
  54.     size="1">.</font>
  55. </address>
  56.  
  57. </body>
  58. </html>