EDN

Zero offset active lowpass filter, part 2

Part 1 of this series addressed a pitfall to be avoided when using Sallen-Key active filters. Please also see my article Avoid Misuse of Sallen-Key Filters. The key point of that essay was that the op ...

Tired of filter costs? These 10 water purifiers offer zero expense for 2 years

Clean drinking water matters in every home. These water purifiers promise zero filter cost or service expense for two years while delivering safe water daily.| Technology News ...
CSR Wire

ZeroWater(R) Offers First US Water Filter Recycling Program

NEW YORK,NY. – October 9, 2008 – ZeroWater(R), a superior pour-through water filter that reduces virtually all particulates to zero parts per million, enables bottled and filtered water users to ...
EDN

Zero offset active lowpass filter, part 3

The circuit in Figure 1 was given to me some while ago as a three-pole, active 1 dB Chebyshev lowpass filter. I never confirmed that its transfer function complied with the Chebyshev polynomial, but ...