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Low Pass Active Filter Circuits
Designed by David A. Johnson, P.E.

Last Updated on:
Tuesday, October 13, 2009 01:26 PM


Master Category List - Dave's Circuits

 

Dave's Filter Circuits:  Band Pass Filters     High Pass Filters      Low Pass Filters     Notch Filters

  • 3KHz LOW PASS FILTER PLUS AUDIO AMP
    This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio. The schematic includes an audio amplifier that is designed to drive a standard audio head phone. The circuit is described in more detail in the receiver section of Dave Johnson's Handbook of Optical Through the Air Communications. (this link is off-site)

 
  • LOW PASS ACTIVE FILTER DESIGN COLLECTION
    This is a collection of inverting and non-inverting active low pass filter circuits.  I included one, two, three, four and six pole filter circuits.  You can change the component value ratios shown, to achieve any frequency cut-off you may need.  The circuit does not specify an operational amplifier.  The circuits should be used to select the needed resistor and capacitor components for a particular frequency knee and roll-off slope.


More Active Filter Circuits
Active Low-Pass Circuits

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