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Circuits designed by David Johnson, P.E.
Last Updated on: Thursday, April 07, 2016 01:02 PM

Master Category List - Dave's Circuits

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Audio Amplifiers

Dave's Amplifier Circuits:      Audio       Buffers         High Frequency-HighSpeed-Wide Band       
High Impedance Circuits      Low Noise      RF (Radio Frequency)       
Transimpedance             Variable Gain      Current  to Voltage Converter

  • 3Khz Filter + Audio Amplifier - 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  [Hobby Corner Circuit by Dave Johnson]  Added May 2005
  • 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. T [Designed by David A. Johnson]  Added December 2007
     
  • 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  [Designed by David A. Johnson]  Added May 2005
     
  • CMOS Logic Inverter Amplifier Characteristics - This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage Amplifiers.  [Designed by David A. Johnson]  Added October 2005
     
  • Filter Audio Signals with Frequencies Higher than the 3KHz - 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. T [Hobby Corner Circuit by Dave Johnson]  Added December 2007

 

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