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| Circuits Designed by Dave Johnson, P.E. : |
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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. . . 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 |
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:
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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. . . 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. __ |
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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 |
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Passive Filters:
Low Pass Circuits |
