Tuesday, September 10, 2013
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3khz Low Pass Filter and Audio Amplifier Circuit Diagram
3khz Low Pass Filter and Audio Amplifier Circuit Diagram
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 Johnsons Handbook of Optical Through the Air Communications.(this link is off-site)
3khz Low Pass Filter and Audio Amplifier Circuit Diagram
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