Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


Passive Filters:  Low Pass Circuits
Passive Filters -- Main Page


Last Updated: November 21, 2017 05:46 AM

Circuits Designed by Dave Johnson, P.E. :

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.-June, 2000

Low Pass Filter, 3Khz, with an 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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.-June, 2000

LC filter Design on-line calculator-  This is an interactive design package for designing analogue ( i.  e.  hardware) filters made of inductors and capacitors ( Ls and Cs).  Fill in the form and press the ``Submit'' button, and a filter will be designed for you. __ Designed by Tony Fisher

Low pass filter for subwoofer-  The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies.  In the low frequencies is degraded the sense of direction.  This reason us leads to the utilization speaker for the attribution of very low frequencies.  The manufacture that to you we propose distinguishes these frequencies, in order to him we lead to the corresponding amplifier.  The acoustic filters are met in various points in the sound systems. __

Low Pass Filter, 3Khz, with an 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 . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Variable Low Pass Filter-  A second order variable bandwidth low pass filter is formed using one IC and some passive components.  This low cost circuit is good out to 2.5MHz. __ Designed by Jim Haggerman, Hagerman Technology LLC

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


Passive Filters:  Low Pass Circuits


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

Copyright  January, 1998 - November, 2017     David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.