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3KHz LOW PASS FILTER PLUS AUDIO AMP

2015-01-17 00:43  
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This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals withfrequencies higher than the 3KHz needed for voice audio. The schematic includes an audio amplifierthat is designed to drive a standard audio head phone. The circuit is described in more detail in thereceiver section of Dave Johnson's Handbook of Optical Through the AirCommunications. (this link is off-site)

 

 

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

 


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