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Sensors / Detectors:  Position Detectors

Sensors / Detectors -- Main Page
 

Last Updated: June 02, 2021 01:44 PM




Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

2 ADC channels double sensor precision -  03/18/99 EDN Design Ideas:  (PDF contains multiple circuits, scroll to find this circuit) The accuracy of the onchip ADCs of numerous small and inexpensive 8-bit mPs is well-suited for many applications.  However, some  situations benefit from.   PDF contains multiple circuits, scroll to find this circuit Design by Luke J Barker, Reinke Manufacturing Co Inc,Deshler, NE

Active Voltage Positioning Reduces Output Capacitors -  DN224 Design Notes__ Linear Technology/Analog Devices

Autozero a position-sensing Detector -  03/18/99 EDN Design Ideas:  Autozeroing schemes can be necessary to minimize the input-offset voltages of position-sensing detectors (PSDs) , particularly when you use these detectors with high dc gain.  PSDs are useful optical transducers for accurately measuring displacement.  in practice, their typical configuration is as a differential current-to-voltage circuit (Figure 1).   Design by James Zannis, Renishaw A, Champs-sur-Marne, France

Autozeroed Amplifier with halved noise needs few components -  10/25/07 EDN Design Ideas:  The unique architecture of the Analog Devices AD8553 instrumentation amplifier permits paralleling devices to lower noise Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Biasing Corrects Position-Sensing Photodiode -  07/07/94  EDN Design Ideas:  An integrator powers the light source in Fig 1's position-sensing circuit, eliminating errors arising from variations in the source's intensity.  This circuit's accuracy is essentially that of the sensor itself, beating designs that use a more complex anal Design by Yishay Netzer, Consultant, Yuvalim, Israel

Daggerboard Position Detector -    NOTE: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Digital position encoder does away with ADC -  05/08/97 EDN Design Ideas:  The position encoder in Figure 1 is a simple yet powerful circuit that converts the change in resistance of a potentiometer into a digital value without using an expensive A/D converter.  The working principle is a resistance-to-PWM converter built around the common 555 timer IC .  A change in the potentiometer's Design by Jose Carlos Cossio, Santander, Spain

Model fixed-point DSP arithmetic in C -  03/18/99 EDN Design Ideas:  NOTE:      - Page
includes several designs.  Scroll to find this one.  You can run initial high-level simulations of custom numerical algorithms, such as digital filters, using floating-point numbers in an environment such as C or Matlab.  Unfortunately, you won't see include fixed-point effects, such as truncation due to limited precision and register overflow, until you use a Hardware Design Language (HDL) , such as Verilog or VHDL.  However, a technique that models these effects in C—the function "bit_limit" in Listing 1—provide as faster execution and better portability than HDLs and allows early exploration of the trade-off between bus width and performance.   Design by Roger Maher, SSL Ltd, Dublin, Ireland

Park Aid -  Three LEDs signal bumper-barrier distance; infra-red operation, indoor use __ Contact Flavio Dellepiane, fladello @ tin.it

Park-Aid Modification -  Three-step beeps signal bumper-barrier distance; infra-red operation, indoor use __ Contact Flavio Dellepiane, fladello @ tin.it

Position Detectors provide Motor-control logic -  05/24/01 EDN Design Ideas:  in the circuit of Figure 1 , assume that a brush-type dc motor must drive a load back and forth between two endpoints on a lead screw.  Optical sensors determine end of travel, and an SPDT switch selects to which end to send the load.  The sensors themselves supply all the necessary directional logic, and a TRIAC powers the motor with the necessary polarity of half-wave pulses from the 13.   PDF have several circuits, scroll for this one Design by Steve Pomeroy and Russell Hedges, Elgar Corp, San Diego, CA

Position sensing of liquid metal antennas for beam scanning antenna arrays -  03/17/14 - EDN Design Ideas:  High gain beam scanning arrays are usually implemented using phased antenna arrays or mechanically controlled parabolic dishes.  However, the aforementioned technologies are widely known as costly ones.  Recently, a new design of beam scanning arrays has been introduced using the liquid metal technology.  Specifically, the antenna is made of a liquid metal volume that is encapsulated in channels and moved mechanically using a single mechanical pump Design by Ahmad Gheethan-1st prize winner in the TI LDC1000 design contest 2014

Rotary Controller Positions Stepping Motor -  EDN Design Ideas:  08/03/95    The circuit in Fig 1 uses a servo potentiometer, as opposed to a rotary switch or encoder, to provide the necessary drive pulses for a stepping motor.  This motor positions a pointer by the rotation of a manual control.  The circuit must be precise, allow a rapid response, and be simple to use. (This circuit was part of a complex apparatus used for a series of physiological tests.) Another requirement is that the control had to be a small, handheld, battery-operated device.    Design by TG Barnett and ME Rosenberg, Department of Physiology, Queen Mary and Westfield College, London, UK

Two ADC channels double sensor precision -  03/18/99 EDN Design Ideas:  (PDF contains multiple circuits, scroll to find this circuit) The accuracy of the onchip ADCs of numerous small and inexpensive 8-bit mPs is well-suited for many applications.  However, some  situations benefit from.   PDF contains multiple circuits, scroll to find this circuit Design by Luke J Barker, Reinke Manufacturing Co Inc, Deshler, NE

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