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 ...
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 ...
Business Wire

ZeroWater® Filter Pitcher, the First Certified to Reduce Lead, Adds Copper Reduction to Extensive List of Certifications

BENSALEM, Pa.--(BUSINESS WIRE)--Zero Technologies, LLC announces that its ZeroWater® filter pitcher has been tested and certified by the Water Quality Association (WQA) for the reduction of copper ...
ZDNet

Brita vs ZeroWater: Two water filter pitcher systems compared

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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 ...