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Sensors / Detectors: Capacitance Sensors

 Audio Acquires the write touch:  02/20/03 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit Capacitance Meter #1: Capacitance Meter #2: Capacitive Sensor likes Parasitics:  09/24/98 EDN-Design Ideas Dual Comparators Stabilize Proximity Detector:  02/16/98 EDN-Design Ideas Femto Capacitance Meter:  This meter measures into the low femtofarad area. Measuring in the femto area allows the smallest capacitors to be measured with precision. Such capacitors are commonly used to compensate for input and stray capacitance in amplifiers. Measure open circuited cables using a multimeter:  09/26/2002  EDN - Design Ideas / You can use a multimeter with capacitance-measurement capability to measure the length of wire or cable to an open circuit. The capacitance of a pair of wires (or a wire to a shield) is directly proportional to the length of the wire. If you know th. Negative Impedance Improves Capacitive Sensors:  03/30/95 EDN-Design Ideas :  11/06/97 EDN-Design Ideas Sense Small Capacitance Changes Over A Wide Range :  09/20/04  Electronic Design - Design Briefs / With this simple circuit connected to a serial port, small capacitance deviations on the order of 0.01 pF can be easily sensed over a wide range of several hundred picofarads (see the figure Solve low frequency cutoff problems in capacitive sensors:  11/28/2002  EDN - Design Ideas /  One of the first problems a capacitive-sensor analog designer must face is the low-frequency cutoff. Theoretically, you must fulfill just one simple requirement: a sufficiently large input resistance of the preamplifier's first stage. In practice, however, many problems lurk behind the seemingly straightforward design rules.. Touch Activated Alarm: