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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 02:04 PM

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Active Low-Pass Circuits

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

3Khz Filter + Audio Amplifier  -  This circuit is the audio amp section for a complete optical transmitter.  The circuit Amplifies and filters the voice audio signals from an electret microphone.  The circuit is described in more detail in . . . [Hobby Circuit designed by Dave Johnson P.E.,  06/04/00]
 

Active Low Pass Filter Designs  -  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 achive any frequency cut-off you may need . . . [Circuit by David Johnson P.E.,  12/10/00]

Low Pass Active Filter Designs  -  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 achive any frequency cut-off you may need . . . [Circuit by David A. Johnson P.E.,  12/10/00]
Passive Low 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 . . . [Circuit by David Johnson P.E.,  06/04/00]:

 

Active Low-Pass Circuits

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

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