When I first heard about PürTrek mashing together trekking poles and a water filter into one product, I was intrigued. I’m a big fan of efficiency and having a water filter always at hand when hiking ...

At IBC2011, Radio Frequency Systems (RFS) announced the availability of the full range of 8-pole models in its line of PeakPower+ bandpass filters. The five 8-pole filters complement the five 6-pole ...

In “Filter DC Voltages Outside Your Supply Rails” we saw how you can re-imagine a popular active bandpass filter topology into a building block for a form of higher-order lowpass filter that doesn’t ...

In the last edition of Don’t Fear the Filter, we built up two examples of the simplest and most-used active filter of all time: the two-pole Sallen-Key lowpass. This time, we’re going to put two of ...

Wideband filters with bandwidths in excess of an octave can be created by cascading a high-pass filter and a low-pass filter. In this design idea, nine-pole high-pass and low-pass filters have been ...