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: 791
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: 1694
perhaps this can help you:
Hobby Circuits and Small Projects Problems :: 28.03.2007 19:07 :: José Luis :: Replies: 1 :: Views: 999
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: 320
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: 21119
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: 1029
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: 1451
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: 2644
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: 4903
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: 3213
Need more information: What do you know about the characteristics of the uncorrupted signal for which you are trying to detect the noise?
Digital Signal Processing :: 11.07.2005 11:45 :: Kral :: Replies: 2 :: Views: 717
You do not have the proper feedback. You have a gain of 1 op amp circuit and put the LC between the inputs.
You would be better off doing a one transistor oscillator circuit that you can find in many books.
Analog Circuit Design :: 16.09.2005 18:13 :: flatulent :: Replies: 4 :: Views: 870
Do any one have complet datasheet from MA/COM sckottky power detector diodes:
(MA4E2037 /MA4E2038) ?
RF, Microwave, Antennas and Optics :: 22.11.2005 00:47 :: rashidmirza :: Replies: 2 :: Views: 776
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: 725
I think you really need an instument to measure electromagnetic field, not pure magnetic.
Maybe selective voltmeter with calibrated antenna or something similar.
RF, Microwave, Antennas and Optics :: 24.02.2006 06:19 :: vdaniel :: Replies: 8 :: Views: 3093
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: 5561
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: 1691
Use a digital
Analog Circuit Design :: 19.03.2011 07:24 :: klystron :: Replies: 5 :: Views: 4841
Magnetic field measurement is totally a relative mesurement. So both are right from their own reference frame.
A similar kind of problem has been discussed in Griffith Electrodynamics, in introduction of special theory of relativity. This can be referred to.
Electronic Elementary Questions :: 18.05.2009 09:06 :: subharpe :: Replies: 3 :: Views: 612
Hello, I want to measure RF power ranging from 20Mhz to 1000Mhz during the field operation. Any DC voltage above 200mv is dangerous to ignite the detonator during perforation operation in the field. The circuit should be IC based and with small antenna at the input. Pl. help.
RF, Microwave, Antennas and Optics :: 13.10.2010 02:21 :: yadav_mrs :: Replies: 22 :: Views: 3340
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: 489
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: 526
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: 786
I am working on inverter 150w using pwm Ic3524 to switch IRFZ44 mosfets.I am not getting the output.
I have tested mosfet individually by connecting it to a battery i.e across drain and source using a 200ohm resistor without giving any gate signal i.e leaving the gate terminal and i am getting about 1amp current flowing across the source and bat
Hobby Circuits and Small Projects Problems :: 29.06.2012 10:21 :: charanbandi :: Replies: 12 :: Views: 963
I want to confirm about if my any designed system is propagating an e.m. wave or not ! i mean no matter its of too short frequency but i want to confirm its working that is it working or not simply :) please help with a simple circuit diagram
Digital Signal Processing :: 08.07.2012 07:12 :: rajaram04 :: Replies: 6 :: Views: 604
Hello newbie here :D
I would like to ask for help in our project...
we're planning on using lux meters as an obstruction detector... the idea is that we will use the changes in value of illuminance in an controlled area... that thing is that we need to connect the lux meter into a computer.... an make a program that will track that change...
Hobby Circuits and Small Projects Problems :: 07.08.2012 12:10 :: sarkhan :: Replies: 12 :: Views: 740
I have a PIR detector in my office that controls the light. Sometimes it doesn't detect me, so I consider building a device to constantly trigger it.
Do you have any idea on how to activly trigger a PIR detector? It is my understanding that they are tuned for 7-14 micrometer wavelength, but few if any diodes are in this range, so one would pro
RF, Microwave, Antennas and Optics :: 10.09.2012 14:42 :: johanfo :: Replies: 3 :: Views: 451
Look for data separators for floppy disks - although those days they are integrated into controllers, there might be some data available. They accept mixed data/clock stream and extract data and clock signals...
Professional Hardware and Electronics Design :: 25.06.2003 14:26 :: Deni :: Replies: 2 :: Views: 794
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: 4178
sum info about Metal Locators.
Basic Types and Design Factors
RF, Microwave, Antennas and Optics :: 11.08.2004 08:36 :: tanveerriaz :: Replies: 5 :: Views: 866
I did see something a long time ago using Hall Effect sensors.
Electronic Elementary Questions :: 11.09.2004 12:17 :: djalli :: Replies: 4 :: Views: 1292
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: 1549
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: 2681
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: 5871
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: 1126
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: 557
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: 1176
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: 1123
i am designing an intelligent traffic monitoring system. i intend upon using 8051. which type of sensor would be suitable. has anybody got a program 4 this project in c language....
Hobby Circuits and Small Projects Problems :: 23.11.2005 23:45 :: oozmaq :: Replies: 2 :: Views: 1539
RF, Microwave, Antennas and Optics :: 26.11.2005 08:15 :: vfone :: Replies: 3 :: Views: 1690
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: 1494
5-7 cm is a little bit to high .. if you consider an extension "arm" you can use QRB1134 device ..
QRB1134 Reflective Object Sensor
The QRB1134 consists of an infrared emitting diode and an NPN silicon phototransistor mounted in a black plastic housing. The phototransistor responds to radiation from the emitting diode only
Electronic Elementary Questions :: 19.08.2006 06:20 :: IanP :: Replies: 3 :: Views: 1153
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: 966
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: 2809
It's of no consequence using PIC. Such measuring instrument must have TV tuner and IF amplifier with IF level detector. Role of PIC should be a selection of TV channel (over I2C) and displaying signal level on LCD.
Hobby Circuits and Small Projects Problems :: 23.07.2007 17:35 :: Borber :: Replies: 3 :: Views: 1450
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: 734
Search in IEEE explorer.
Some papers might me available.
RF, Microwave, Antennas and Optics :: 30.04.2008 08:39 :: Abhishekabs :: Replies: 6 :: Views: 3459
has the RF field strength power meter for 100MHz-3GHz, for Mobile Phone, mobile phone base station RF radiation levels safety measurement.
the LED version is only about US$25 on the ebay.
Hobby Circuits and Small Projects Problems :: 01.01.2009 00:15 :: abc123 :: Replies: 5 :: Views: 1833
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: 1232
I think, it is working for magnetic field.
Analog Circuit Design :: 14.10.2009 22:15 :: pcwortex :: Replies: 1 :: Views: 512