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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Friday, April 25, 2008 04:12 PM


Active Filters: Low Pass
 
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)

Click on Drawing Below to view PDF version of Schematic

3KHz Low Pass Filter & Audio Amp designed by Dave Johnson, P.E. (June 4, 2000)

Active Filters: Low Pass
Master Schematic Category List - David A. Johnson, P.E.
 

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