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Text File  |  1997-03-07  |  2KB  |  57 lines
  1. <html>
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  3. <head>
  4. <meta http-equiv="Content-Type"
  5. content="text/html; charset=iso-8859-1">
  6. <meta name="Author" content="Joakim Ögren">
  7. <meta name="Description"
  8. content="Formulas for a 1st order Butterworth active lowpass filter.">
  9.  
  10. <title>HwB: Active Filter: Butterworth 6dB Lowpass</title>
  11. <meta name="Keywords"
  12. content="HwB, pinout, hardware, butterworth, filter, active, lowpass, 1st, 6">
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  16. </head>
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  18. <body stylesrc="menu_Misc_Top.html"
  19. background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
  20. link="#0000EE" vlink="#551A8B" alink="#FF0000">
  21.  
  22.  
  23. <p align="center"><a href="menu_Misc.html"><img
  24. src="images/mini_Back.GIF" alt="GoTo Misc" border="0" width="64"
  25. height="48"></a><img src="images/menu_Misc.GIF" alt="MISC"
  26. width="400" height="48"><a href="hwb.html"><img
  27. src="images/mini_hwb.GIF" alt="GoTo Main" border="0" width="64"
  28. height="48"></a></p>
  29.  
  30.  
  31. <h1>Active Filter: Butterworth<br>
  32. (1st order, 6 dB/octave, Lowpass)</h1>
  33.  
  34. <p><img src="images/misc_ActiveFilter1L.GIF"
  35. alt="1st order Butterworth Lowpass" width="191" height="111"></p>
  36.  
  37. <p>R=4.7k-10 kOhm<br>
  38. C=1.000/(2*pi*Fc*R)</p>
  39.  
  40. <address>
  41.     <font size="2">Contributor: </font><a
  42.     href="mailto:qtech@mailhost.net"><font size="2">Joakim Ögren</font></a>
  43. </address>
  44.  
  45. <address>
  46.     <font size="2">Source: ?</font> 
  47. </address>
  48.  
  49.  
  50. <address>
  51.     <font size="1">Please send any comments to </font><a
  52.     href="mailto:qtech@mailhost.net"><font size="1">Joakim Ögren</font></a><font
  53.     size="1">.</font> 
  54. </address>
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  56. </body>
  57. </html>