I'm a total novice when it comes to this, I'm designing a Spectrum Analiser 20 columns wide and 30 rows up and have worked out a small portion with the use of LM3914 to represent a column, I need to know how to activate the band thats lighting up and how to filter from the left 32Hz to the right side of 16000kHz evenly spaced along the 20 columns I need bandpass filters op amps and peak detectors and have been put onto the sallen key filter to help with part of it. I,m uploading the first column as an .asc file! thanks for looking.
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