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Text File  |  1997-11-23  |  2KB  |  58 lines
  1. <html>
  2.  
  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">
  13.  
  14.  
  15. </head>
  16.  
  17. <body stylesrc="menu_Circuit_Top.html"
  18. background="images/bgr_grey.jpg" bgcolor="#C0C0C0" text="#000000"
  19. link="#0000EE" vlink="#551A8B" alink="#FF0000">
  20.  
  21.  
  22. <p align="center"><a href="menu_Circuit.html"><img
  23. src="images/mini_Back.gif" alt="GoTo Circuit" border="0"
  24. width="64" height="48"></a><img src="images/menu_Circuit.gif"
  25. alt="CIRCUIT" width="400" height="48"><a href="hwb.html"><img
  26. src="images/mini_HwB.gif" alt="GoTo Main" border="0" width="64"
  27. height="48"></a></p>
  28.  
  29.  
  30. <h1>Active Filter: Butterworth<br>
  31. (1st order, 6 dB/octave, Lowpass)</h1>
  32.  
  33. <p><img src="images/cir_ActiveFilter1L.gif"
  34. alt="1st order Butterworth Lowpass" width="191" height="111"></p>
  35.  
  36. <p>R=4.7k-10 kOhm<br>
  37. C=1.000/(2*pi*Fc*R)</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="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>