Richard Ottosen has developed a version of the Digital Frequency Synthesizer described in Tom Napier's article "Digital Frequency Synthesis" in issue 99 (October 1998) of Circuit Cellar INK (http://www.edtn.com/embapps/emba057.htm). The frequency is set by a serial input and can varied from less than 1Hz to over 500KHz.
Richard Ottosen has developed an improved version of the Digital Frequency Synthesizer described in Tom Napier's article "Digital Frequency Synthesis" in issue 99 (October 1998) of Circuit Cellar INK (http://www.edtn.com/embapps/emba057.htm). It uses direct digital synthesis (DDS) to generate sine, triangle and square waveforms. The frequency, waveform and amplitude are all set numerically. The frequency can be varied from less than 1Hz to over 500KHz. The amplitude can be a few millivolts to a few volts.
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