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Re: Can I design a variable frequency filter for a Wah Wah effect?

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     Hello CL91,

 

     Try using a state-variable (Q/F Input) filter as shown below.  You'll find it under Miscellaneous Filters.  Help for this filter block is found at

http://wiki.analog.com/resources/tools-software/sigmastudio/toolbox/filters/statevariableqfinput

 

Wawa-state-var-filter-sch_pic.jpg

     As shown here,  the pot on your -1701 eval board adjusts the filter's frequency.  For this to work you'll need to set MP8 in your project's Hardware Configuration / Register Control window to ADC3:

Wawa-hdwe-config_pic.jpg

     Once you have the filter working you're free to mix in the original signal and sweep the frequency with an oscillator, etc..  Have fun!

 

 

     Best regards,

 

     Bob


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