A classic example of application is a crossover, which uses the bass speakers.
But even in modern signal processing auxiliary services are necessary as the low pass anti-aliasing filter at the input of an AD converter to avoid sampling error.
passive and active links to this circuit concepts for low pass
Here you will find Schematic Circuit Diagram for DIY and further information on Low-pass (low pass)
|Fundamentals of low pass filter with simple RC members||www.loetstelle.net/grundlagen/rcglied/rcglied.php|
|Active low pass Operationsverstaerker||esdstudent.gcal.ac.uk/WebReports/dodonnell/lp.html|
|Active crossover with low-pass||sound.westhost.com/project78.htm|