Search results for "Potentiometer"

showing 4 items of 4 documents

Bio-impedance Imitator for Reography

2007

In this paper two electronic imitators of the bio-impedance - based on a digital analog converter and digital controlled potentiometer are discussed.

Digital analog converterPatient diagnosisbusiness.industryComputer scienceElectrical engineeringBio impedancePotentiometerbusinessDigital potentiometer2007 4th IEEE Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications
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Control of the speed of a DC motor by employeeing pulse width modulation (PWM) technique

2009

This paper is mainly focused on the technique of pulse width modulation for controlling the speed of a 12 volt DC motor more efficiently. A potentiometer was used to generate a wide variety of pulses. The output of the controlling circuit (Pulse Width) was connected to the second circuit as input for direction control. Here a single push switch was used to change the state (stopforward-stop-reverse) of the DC motor. These two circuits were combined into one for ease of use. Third circuit was designed to measure the speed of the motor by employing an opto-electronic sensor, an amplifier and a two blade fan to interrupt the signal transmission of the sensor. Finally, the output of the sensor …

PhysicsPulse-frequency modulationbusiness.industryDuty cyclePush switchAmplifierElectrical engineeringPotentiometerOscilloscopebusinessDC motorPulse-width modulation2009 12th International Conference on Computers and Information Technology
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A novel technique for the CMRR improvement in a portable ECG system

2017

This paper presents a new technique to improve the quality of the ECG signals, increasing the Common Mode Rejection Ratio (CMRR). We developed a portable wireless Bluetooth ECG system able to acquire 12 leads, communicating with Smartphones and PCs. Many experiments have been made for measuring CMRR decay due to the difference on skin-electrodes impedances, the asymmetries of the amplifiers input stages and external components. Using some digital potentiometers, the system is able to compensate for these, increasing the CMRR of about 18 dB.

Portable Electronicsbusiness.industryComputer scienceECGAmplifierBioelectronicDigital potentiometerSettore ING-INF/01 - Elettronicalaw.inventionBluetoothProgrammable-gain amplifierCommon-mode rejection ratiolawElectronic engineeringWirelessCommon-mode signalEmbedded SystembusinessElectrical impedance
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Observable Variables in Thermoelectric Phenomena

2002

New transport equations for the thermoelectric phenomena have been deduced. All of the variables in this formulation are observable quantities. The limitations of the usual formulations, which work with nonobservable quantities, have been overcome. The electric potential can be measured by using auxiliary probes which connect the electronic conductor to a potentiometer. This observable electric potential depends on the nature of the probes but not on the room temperature where the potentiometer is placed. Also, we emphasize that absolute values for the thermoelectric power are in contradiction with the thermodynamic limitation of measuring electric potential differences in these systems. Th…

SuperconductivityWork (thermodynamics)ChemistryThermodynamicsObservableSurfaces Coatings and FilmsConductorQuantum electrodynamicsSeebeck coefficientThermoelectric effectMaterials ChemistryPotentiometerElectric potentialPhysical and Theoretical ChemistryThe Journal of Physical Chemistry B
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