64 Threads found on edaboard.com: E Field Detector
I need to article "Magnetic field detector by Andy Flind " published
EPE magazine January 1995 . dose anybody having it?
If yes , please upload here or send to my email box: firstname.lastname@example.org
Thanks in advance .
Electromagnetic Design and Simulation :: 14.05.2011 04:35 :: aft_72005_1 :: Replies: 0 :: Views: 900
I'm looking for a design of low level electric field detector too.
I'm interested in the principle of operation of this probe:
Can anybody help us?
Professional Hardware and Electronics Design :: 24.03.2004 09:43 :: nebisman :: Replies: 1 :: Views: 1824
perhaps this can help you:
Hobby Circuits and Small Projects Problems :: 28.03.2007 19:07 :: José Luis :: Replies: 1 :: Views: 1108
i need the following papers. pls upload if you have.
1. Kordic, S., Integrated silicon magnetic-field sensors. Sensors and Actuators. v10. 347-378.
2. High sensitivity silicon magnetic field detector
Custom Integrated Circuits, 2001, IEEE Conference on.
Volume , Issue , 2001 Page(s):105 - 108
Analog Circuit Design :: 19.06.2008 02:20 :: wonbef :: Replies: 0 :: Views: 399
the best solution is to make use of a ccd and watch the iron content in the bload
a ccd when you emit a magnetic field and tune the frame refresh to
the mag field freq you will see the iron or the polerised particules etc etc
as harmonics of the mix freq
so... you can split the ccd into different colours blocks
Other Design :: 10.09.2003 10:56 :: sick_man :: Replies: 62 :: Views: 21511
I want to design a portable system for sense charged power lines and systems for human protection near power ssystems.
For this, I need a sensor for measure low level electric fields (which is about 20-30 V/M). Can you give me an advice about some semiconductor device for do it ?. Could you give some basics of principles for appro
Electromagnetic Design and Simulation :: 19.03.2004 09:10 :: nebisman :: Replies: 3 :: Views: 1158
Hi I was involved some years ago in the field of machine vision ..
There ares several aproaches that you can do ..I Advise you first to start to UNDESRTAND SEGMENTATION .and edge detection .. INTEL has very nice LIBS .. look for them .. Now .. Once you UNDERSTAND how a MACHINE can SEE .. then you have to build a SYSTEM to compare "FEATURES" t
Digital Signal Processing :: 29.03.2004 12:17 :: eltonjohn :: Replies: 5 :: Views: 1487
Do you need CA to measure capacitor or charge?
Charge amplifers are used in micromechanical sensors. But charge is changed there because capacitor changes. And if the speed of capacitor deviation is low, it is better to use capacitor to voltage convertors.
Analog Circuit Design :: 14.05.2004 13:15 :: JNekas :: Replies: 4 :: Views: 2861
You should use the following sequence: wire antenna, broad band RF amplifier, diode detector, indicating method.
A simpler method which is not as sensitive is the wire, diode, oscilloscope.
Hobby Circuits and Small Projects Problems :: 13.11.2004 14:15 :: flatulent :: Replies: 8 :: Views: 5185
There are several circuits, but the basic principle is the same for all of them. You use a "search coil" that you move over the area where the metal might be found.
As the moving coil passes over the metal object, the presence of the metal in the coil's field causes a change in the field.
Some detectors use a tuned circuit. When a (...)
Hobby Circuits and Small Projects Problems :: 23.05.2005 23:28 :: House_Cat :: Replies: 20 :: Views: 3509
I and my group planned to have a project about noise level detector using DSP for our project design...and we are wondering if what are the things we should gather to produce the hardware...i mean the materials needed..does it cost much?? somebody please help us...we need your advice...what particular devices that can detect noise level?and where c
Digital Signal Processing :: 09.07.2005 06:14 :: ckt.R :: Replies: 2 :: Views: 779
Hi all, Im suppossed to build an electromagnetic field detector, I was thinking about using a coil as a probe to detect low freq changes in magnetic and electric fields (as to detect hidden wiring for example) (its not supposed to use any special purpose IC's)
I know absolutelly nothing about osc. theory, so I got this schematic but it (...)
Analog Circuit Design :: 16.09.2005 17:05 :: linkyta :: Replies: 4 :: Views: 985
- go to
- enter MA4E2037 in field Part Number Search
- mark Contains
- click Find Part
- click View All Documents
- click View
RF, Microwave, Antennas and Optics :: 22.11.2005 16:39 :: VSWR :: Replies: 2 :: Views: 870
I see a problem if you trigger a water line to put out fire caused by spark or electric malfunction would create a havoc as water is conductor of electricity (unless it is very pure) and this would cause trouble.
Try using a system that trigger a DCP (Dry Chemical power) or a Form type extinguishing system.
Now coming to the case
Embedded Systems and Real-Time OS :: 01.02.2006 08:20 :: kalyanram :: Replies: 2 :: Views: 809
Hi all :) ,
I have a very stupid question to ask.
If I wanted to measure the magnetic field around a loop antenna how would i go about doing it and what equipment would I need. I'm not clear on the methodology :(
Any advice is much appreciated
RF, Microwave, Antennas and Optics :: 23.02.2006 10:59 :: Catalyst :: Replies: 8 :: Views: 3159
not the expert in this field but I would say that the only difference might be in the time constant used in video portion of detector circuit. For peak detector the constant should be very small so that instantaneous value of the signal is detected, for RMS detector it should be long so that integrator like (...)
RF, Microwave, Antennas and Optics :: 25.08.2006 07:53 :: flyhigh :: Replies: 9 :: Views: 6101
What Verba is trying to tell you is that the "Gold detectors" that you see advertised for sale are just ordinary metal detectors with sensitiviy enhancements. They use different frequencies, sense coil sizes, and pulsed signal techniques to allow detection of small metallic objects against a background of metallic oxide sand, or other naturally in
Hobby Circuits and Small Projects Problems :: 27.10.2006 16:06 :: House_Cat :: Replies: 3 :: Views: 1781
How can I make a precision Peak detector?
Analog Circuit Design :: 28.02.2008 11:22 :: emreozer :: Replies: 5 :: Views: 5287
There are two men.....
One is sitting on a moving wagon and is holding a Coulomb of charge in his lap.
The other is stood by the roadside, watching the wagon go past him.
Both men have Magnetic field detectors with them.
The man on the wagon detects no magnetic field with his detector.......sounds about (...)
Electronic Elementary Questions :: 17.05.2009 13:02 :: eem2am :: Replies: 3 :: Views: 683
So, you shut down everything. Mobile phones, broadcast stations, power lines, CATV, (you forgot the satellites), instead making a simple and immune RF
RF, Microwave, Antennas and Optics :: 14.10.2010 04:58 :: vfone :: Replies: 22 :: Views: 3593
if I got two RF signal sources, one, which transmit at 2GHz 20mW/m2 at 1 meter distance and the other which transmit at 3GHz 10mW/m2 at a 1 meter distance. Should the RF field strength power meter show 30 mW/m2 at 1 meter distance from them? or just the 20mW/m2 (from the strongest signal source)?
RF, Microwave, Antennas and Optics :: 30.03.2011 21:18 :: abc123 :: Replies: 7 :: Views: 592
Please look into a textbook. The near-field zone of an antenna is defined from the ratio of its aperture size to wavelength.
Large antennas (with apertures many times larger than the wavelength) in fact shape their main lobe of radiation pattern quite far on axis.
Satellite communication antennas (like Intelsat) form their main beam up to hundred
RF, Microwave, Antennas and Optics :: 06.05.2011 15:26 :: jiripolivka :: Replies: 4 :: Views: 601
dear all greetings,
i am trying to build a metal detector sensor based on LC circuit (at resonance). which leads to any metal come in the range of the magnetic field of the coil will leads to drop in the voltage so that i can sens it with amicro controller. now here is the problem the resonance frequency is 130khz (using a generator) now
Analog Circuit Design :: 27.12.2011 16:22 :: nxt_ :: Replies: 1 :: Views: 1077
You probably left the gate floating. As mentioned by Brad, you need to pull the gate low.
When designing circuits with MOSFETs, you should ALWAYS use a pull-down resistor from gate-to-source. Value could be between 1k to 4.7k. You'll find plenty of threads of MOSFET failure, where the solution was the pull-down resistor.
Hobby Circuits and Small Projects Problems :: 30.06.2012 03:37 :: Tahmid :: Replies: 12 :: Views: 1089
what is the freq.
Digital Signal Processing :: 08.07.2012 15:25 :: Shehata :: Replies: 6 :: Views: 779
Over what range do you need to detect obstruction? and what field of view angle? I am thinking of a simpler pulsed IR Rx and Tx. Any voltage available? for detector?
What user interface is necessary? desirable?
Hobby Circuits and Small Projects Problems :: 07.08.2012 16:50 :: SunnySkyguy :: Replies: 12 :: Views: 831
7-14 ?m is far IR rather than visible light, fully absorbed e.g. by glass windows, but passed by polyethylene films. Any pulsed heater can be used as a far IR source.
RF, Microwave, Antennas and Optics :: 10.09.2012 15:08 :: FvM :: Replies: 3 :: Views: 667
I am looking for a hardware clockrecovery circuit that is able to derive the clock from a 300 kbps datastream. The datastream is the output of a FM detector.
Anyone with expierence in this field?
Professional Hardware and Electronics Design :: 25.06.2003 08:37 :: beagle :: Replies: 2 :: Views: 954
It get challenged if you are doing the didoe rectification in RFID . Convert the power from couple magnetic field and pump to the workable voltage for IC .
Electronic Elementary Questions :: 09.08.2004 12:58 :: Nobody :: Replies: 20 :: Views: 4359
sum info about Metal Locators.
Basic Types and Design Factors
RF, Microwave, Antennas and Optics :: 11.08.2004 08:36 :: tanveerriaz :: Replies: 5 :: Views: 926
I did see something a long time ago using Hall Effect sensors.
Electronic Elementary Questions :: 11.09.2004 12:17 :: djalli :: Replies: 4 :: Views: 1369
Interface circuits such as USB PHY, IEEE-1394, DVI, and LVDS are good examples of mixed-mode signal ICs.
If SOC is the future, mixed-mode signal will be the key.
Analog IC Design and Layout :: 28.10.2004 03:56 :: tlihu :: Replies: 19 :: Views: 1649
Looking to the formula from above link seems that you need a lot of pressure to get some speed indication. What about when the boat will have 10 km/hour?
I think Pitot tube on a boat is a joke.
Microcontrollers :: 11.01.2005 15:11 :: vfone :: Replies: 12 :: Views: 3062
you might be able to use some ideas from here
Hobby Circuits and Small Projects Problems :: 13.03.2005 05:40 :: jshroff :: Replies: 20 :: Views: 6070
I guess beabroad is referring to burst-mode CDR in optical communication systems, which is recently inspired by the high demand of GPON transceivers in Asia (Japan and China).
Up to date, I don't get a good design reference in this type CDR. Actually you will find the reference for burst-mode driver/TIA is also very limited. Real markets are pre
Analog Circuit Design :: 11.03.2005 23:03 :: xshou :: Replies: 6 :: Views: 1231
In this circuit everything will depend on the first transistor, Q1, and on quality of 470pF capacitor. Try polystyrene type capacitor as they have very high insulation resistance..
As Q1 you need to select one with very, ver high β, Iwould say close to 1000. Try high quality low noice audio transistors such as BC559C and select one with the h
Hobby Circuits and Small Projects Problems :: 08.07.2005 04:20 :: IanP :: Replies: 2 :: Views: 628
My PIR sensor circuit is sensitive to RF field variation.
Please check attachement for the circuit.
At the moment when RF field got applied or removed or variated. TP13 output a trigger signal which is strong enough to trigger a detector.
Seems its the voltage variation when subject to RFI leads to the false trigger. How to get rid of (...)
Analog Circuit Design :: 09.10.2005 13:14 :: Nicholas :: Replies: 1 :: Views: 1282
You can store a current in an inductor (magnetic field), or a voltage in a capacitor (electric field). A charge-coupled device (CCD) stores an array of analog voltages in an array of capacitors. DRAM and some ROMs use capacitors too, and some of them recognize mutiple voltage levels as distinct bits. A magnetic tape recorder ... well, you get the i
Electronic Elementary Questions :: 21.11.2005 03:47 :: echo47 :: Replies: 6 :: Views: 1247
Have a look at this publication:
"DEVELOPMENT OF AN AUTONOMOUS ADAPTIVE TRAFFIC CONTROL SYSTEM"
It will be a very good starting point ..
An essential feature of any dynamic traffic control system is its capability to compute traffic flow rates at t
Hobby Circuits and Small Projects Problems :: 24.11.2005 00:03 :: IanP :: Replies: 2 :: Views: 1667
RF, Microwave, Antennas and Optics :: 26.11.2005 08:15 :: vfone :: Replies: 3 :: Views: 1866
Could any one know how to obtain the modal properties of photonic crystal fiber like effective index, dispersion, .... from the FDTD method.
I know that we must take first FFT then what?
Electromagnetic Design and Simulation :: 09.08.2006 08:36 :: engmfarhat :: Replies: 12 :: Views: 1580
which IRLED+photo diode combination should I use for
edge detection I got 5-7cm clearance b/w the robot body & ground
plzzzz tell me the part no. that is easily available in market & inexpensive
Electronic Elementary Questions :: 19.08.2006 05:19 :: hameeds01 :: Replies: 3 :: Views: 1237
I think will be very difficult to complain with this because the amplitude of the RF signal is very variable depending on the RF field surronding the antenna, instead you have not a so wide dynamic range on the laser modulation.
Even trying with a log detector it will not modify the situation because the frequency and phase informations will be lo
RF, Microwave, Antennas and Optics :: 26.09.2006 18:12 :: FANT :: Replies: 6 :: Views: 1072
A red, infrared or any color led will easily reach 1 metre away.
Proper lensing is the answer if narrow beam is wanted, or for narrow field of view detection.
Pulsed modulation is the answer if other ambient light rejection is wanted.
Don't say you can not see a led lit at 20 metres away...
Where do the 'sophisticated' opinion and 'an infr
Hobby Circuits and Small Projects Problems :: 20.05.2007 19:01 :: Externet :: Replies: 7 :: Views: 3033
I'd like to design a circuit to measure the terrestrial TV signal level (measured in db?V) on a display. As you well know, this is a function available on a TV field Strength Meter.
This circuit must allow you to select the TV channel (frequency) so you can then measure the signal level at that frequency
Have you some idea o
Hobby Circuits and Small Projects Problems :: 23.07.2007 16:15 :: overflow :: Replies: 3 :: Views: 1539
Now depends in what kind of near-field you are. For example in Reactive Near field the Electric-E and Magnetic-H fields are not orthogonal, and polarization is not a meaningful parameter.
Myself, I would go in the far field to measure the polarization of the antenna.
RF, Microwave, Antennas and Optics :: 09.12.2010 13:53 :: vfone :: Replies: 2 :: Views: 818
i need to design for rf part ( transmitter and receiver).where can i find source of infornmation on fmcw radar design
this is my parameter
To design and construct a polarimetric FMCW Imaging System. The proposed system should have the capability to measure the complex scattering matrices of distributed targets using FMCW system and produ
RF, Microwave, Antennas and Optics :: 29.04.2008 09:10 :: alan6449 :: Replies: 6 :: Views: 3596
i wanted mobile phone sensor plz help me
Hobby Circuits and Small Projects Problems :: 23.12.2008 11:46 :: appus12345 :: Replies: 5 :: Views: 1894
I want to make CHECKPOINT FREQUENCY SECURITY TAGS detector. Suppose Tags works @8.2MHz, and are taken from EAS (Electronic Article Surveillance system) from store.
Any ideas, schematics... firmware for mcu is not problem, but hardware?
Thanks in advance,
RF, Microwave, Antennas and Optics :: 06.08.2009 07:19 :: supersonicPM :: Replies: 2 :: Views: 1430
I think, it is working for magnetic field.
Analog Circuit Design :: 14.10.2009 22:15 :: pcwortex :: Replies: 1 :: Views: 596