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Cellular Phone Helper - When your cellular phone receives a call,
it begins transmitting even before you answer. The circuit shown in fig.1
detects this signal and can operate a variety of devices referred to as
"load"….(circuit / design added 8/03)
Electronic Eavesdropping Devices Detector - Copyright of this
circuit belongs to smart kit electronics. In this page we will use this
circuit to discuss for improvements and we will introduce some changes based
on original schematic…..(design idea circuit added 09/08) [Site is under
construction right now]
Improving Temperature, Stability, & Linearity of
High Dynamic Range RMS RF Power Detectors - AN-653 Analog Devices Application
Notes (app note added 3/06)
Input filter prevents
instrumentation-amp RF-rectification errors - 13-Nov-03 Issue of EDN
Instrumentation amplifiers serve in a variety of applications that need to extract a
weak differential signal from large common-mode noise or interference. However,
designers often overlook the potential problem of RF rectification inside the
instrumentation amplifier. The amplifier's common-mode rejection normally greatly
reduces common-mode signals at an instrumentation amplifier's input.... [Design Idea
by Charles Kitchin, Lew Counts, and Moshe Gerstenhaber, Analog Devices, Wilmington,
MA]
