08 Mar '17, 6pm

Don’t Fear the Filter: Lowpass Edition https://t.co/CT1niufi9y

Type : What frequencies do you want? Which do you want to get rid of? This determines whether you want a lowpass or highpass or bandpass filter, for instance. Today, we’re going for a lowpass . Topology : This is the actual circuit design. Here, we’re looking at a simple Sallen-Key filter topology because it’s stable and makes the lightest demands on the op-amp that we’re using. Even so, we’ll see that op-amp choice can matter. Order/Rolloff : The rate at which the high frequencies are rolled off depends on the order: the number of reactive components (here capacitors) in the design. You can make steeper filters if you need to by cascading single stages, and we’ll do that later. For now, we’ll be satisfied with a second-order filter that reduces the amplitude of the signal by a factor of four for every doubling of the frequency (a -12 dB per octave rolloff). Response : Som...

Full article: http://hackaday.com/2017/03/08/dont-fear-the-filter-lowpa...

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