FIL I.4 – Active Filters

In the previous post we went over passive LC filter design.  LC filters do have many advantages: they are simple to understand and design and they don’t require an external power supply.  They also are the only solution for higher frequencies.  That said, they cannot provide gain.  Instead, some power is lost when the signal goes…

FIL I.3 – Filter Design Basics

The math behind filter design is actually very complex, and the equations that determine component values are complicated.  Fortunately, most of that complexity will be transparent to you!  Good news, you’ll never have to work from scratch when designing filters.  Instead, filter design relies on using tables of normalized values, then extrapolating these values…

FIL I.1 – Introducing Filters

Filters are an important building block you will find in nearly all fields of electronics.  They are of particular interest to the ham radio experimenter and RF designer.  Out of all the building blocks of radio electronics, filters are perhaps the most simple to understand.  Simple doesn’t mean unimportant however, as filters are a necessary…