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64 Threads found on edaboard.com: E Field Detector
Hi ALL 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: aft.72005@gmail.com Thanks in advance .
anyone has electric field meter circuıt design? everybody selling but I can' find a circuit :roll:
hussain_kiet, perhaps this can help you: bye !!!
hi, all, 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 Doyle, J. Custom Integrated Circuits, 2001, IEEE Conference on. Volume , Issue , 2001 Page(s):105 - 108 3. (...)
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
Dear friends: 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
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
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.
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.
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 (...)
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
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.
- go to - enter MA4E2037 in field Part Number Search - mark Contains - click Find Part - click View All Documents - click View
Hi buts101, 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
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 Kind Regards Cat :)
Hi, 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 (...)
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
Use a digital
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.
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. yadav
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)?
Hi, I would like to know, how is the correct distance between the antenna under test and the probe using the planar near-field technique. Someone could help me to understand more about this. thanks Marco
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
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.
what is the freq.
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?
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.
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...
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 .
sum info about Metal Locators. Basic Types and Design Factors
I did see something a long time ago using Hall Effect sensors.
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.
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.
you might be able to use some ideas from here
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
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
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 (...)
Hi all, We know that digital circuit use RAM and D-FF to store digital signal values. Is there any "Analog" RAM and D-FF which can store analog signal values? I am curious to know if not, how to store analog signal values in analog way? Any suggestions will be appreciated! Best regards, Davy
HI 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....
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?
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
Could anyone tell me the output power of the antenna, in other words , the input power of LNA that follows the antenna in 802.11b systems. Thanks!
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
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.
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.
Search in IEEE explorer. Some papers might me available. Also try
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.
Friends, 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, Peja
I think, it is working for magnetic field.