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Low Pass Active Filter Circuits
Designed by David A. Johnson, P.E.
Last Updated on:
Friday, April 25, 2008 04:12 PM
Master Category List - Dave's Circuits
Band Pass Filters
High Pass Filters Low Pass Filters
Notch Filters
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- 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)
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- 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.
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More Active Filter Circuits
Master Category List - Dave's Circuits
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