This subwoofer active filter circuit is a 24 dB octave filter with a Bessel character and cutoff frequency of 200 Hz. So, if you are interested in experimenting with audio circuits in subwoofer range, ...

Looking at the block diagram you can see where I have inserted ... Looking into the components of a simple RC filter which can easily implement a simple Low Pass or High Pass filter, we see ...

For instance, you could write a filter circuit generator ... some of you will like SKiDL for circuit design. We’ve become so accustomed to the circuit diagram as the means of thinking about ...

This happens independent of the applied recording medium. To remove this unwanted low frequencies, subsonic filters like the circuit featured here is used. The subsonic filter is actually an active ...

We can see how circuits work, and represent them with some simple diagrams, using basic electrical components like these. You start with a cell, or combination of cells. These could be batteries ...