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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. The circuit is
described in more detail in the receiver section of Dave Johnson's Handbook of
Optical Through the Air Communications.
Audio AMP + 3kHz Filter - This circuit is the audio amp section for a complete
optical transmitter. The circuit amplifies and filters the voice audio
signals from an electret microphone. The circuit is described in more detail in
the receiver section of Dave Johnson's Handbook of Optical Through the Air
Communications.
