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67 Threads found on edaboard.com: Wire Detector
Hi, I want to make a wire detector... Today when I was drilling a hole in the wall I drilled a wire too, and it wasnt soposed to be there:) So if anyone have a schematic I would appreciate it... I dont want that to happen again, Thanks!!!
Look for an Inductive Loop Vehicle Sensor. Its basically just a LC multivibrator that uses the inductive variability of a loop of wire on the road. When a vehicle passes over or stops over the loop the frequency of the multivibrator shifts and a microcontroller can sense this, setting a flag. There is plenty of information on building the loops and
it is exactly the same as any other detector appart from the larger coil .... maybe only use 5 turns of .22 mm will be perfect use a foil tape as a fariday shield the rule is double the size of coil half the number of turns so say a 19cm @500khz = .51mm wire and 27T use a pi {pulse induction} dete
use shift register and some logic is sufficient. for exampl, if you want to detect sequence 1011, you can use following verilog code to do it. wire signal_in; wire seq_detected; reg signal_d1, signal_d2, signal_d3; always @(posedge clk or negedge rst_n) if (~rst_n) begin signal_d1 <= #1 1'b0;
Hello *Zilot*, have one unit ready for 900Mhz, and yes its working. Just one thing: start first with 8 cm of wire for both antennas, and continue cutting mm by mm till good signal sensing. for 1800Mhz i will try making antenna on pcb, something microstrip. good luck mgf
Dear All i have an equipment that's powered by a 3 phase 4 wire source I'm looking for a circuit that detect if the neutral wire is connected to the instrument or not looking for your help.
I know this is very problem because scanning all frequencies is something can not be done with a simple RF hobby circuit. But what if (help me here) if something can be sensed via some Hall Effect, Wiegan Effect IC, circuit of a presence of energy in close range to mean something might be going on?
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.
For safety reasons you will have to use very low power. Here is one thing to try. Put a resistor between the source and the wire. Measure the voltage on the wire. Another thing to measure is the phase shift between the source and the wire. A phase detector as used in PLL circuits can be used. If the frequency is low (...)
In your case you will be using 4 connections: +12V (+i/p), 0V (-i/p), COM and N/C. Don't worry about anti-tamper, although you ca conet it in series with COM or N/C contact, so if someone tries to open the enclosure it will also set-off an alarm, but it is optional .. On the ToothPIC select which input would you like to connect to the sensor: I g
There is a way to detect it electronically, the so-called "hot-wire" method. Basically you have a resistor bridge, where sufficient current passes through it that the resistors heat up. Only one of the resistors is exposed to the airflow. Because of the airflow, this resistor cools down, its resistance becomes different from that of the non-ex
Using an RCA Video Jack, I am trying to detect the signal on a yellow composite wire/jack/plug when the video image inverts. Essentially I would like to have a simple circuit that will show when the image inverts and indicate it with an LED. If anyone has any suggestions please post :idea:. Cheers.
I am searching for thoughts or ideas on catching, detecting, or seeing analog inversion. I figured I would inquire about a microcontroller solution with minimum circuitry or expense. Using an RCA Video Jack, I am trying to detect the signal on a yellow composite wire/jack/plug when the video image inverts. Essentially I would like to have a simp
Most common way is to use two coils of wire. They must be isolated and work like transformer. Feed first coil with some small AC voltage, measure feedback from second coil. Once you put some metal object near coils you will have a change in second coil output. Size of coils, number of turns, voltage, sensitivity etc - will all depend on your existi
I'm an AC idiot so I could use some help as I try to better myself. I am trying to build a low cost, low power circuit that will detect when an AC voltage is passing through a set of wires, and then blink an LED to indicate this. I don't want to tap into the AC wires, but want to sense that voltage is flowing through them through induction. I ha
For temperature might easiest to use digital sensor with I?C or 1-wire interface. For vibration use acceleration sensors.
dear sir i was looking for a Live-line detector , and i found the following one but the problem that i depends on the cap. coupling and such coupling done not only through the wire but any thing near the circuit (my body , my hand ...etc) the led keep flashing , never sto
Can any one help me with a EMF detector as I build one on Bread Board using two BC 3904 to make a Darlington pair and a BC 3906 with the base of the 3906 connected to the collector of the Darlington pair 3v on the emitter of the BC 3906 the positive side of a buzzer and led connected in series on the collector with the neg to the emitter of the Da
I suggest a wire antenna followed by several cascadable amplifier modules and then a diode detector and then an op amp stage and then an analog meter or a comparator.
You will need to wire up another oscillator (needs to be very stable... try using XO) as reference and use a phase comparator to compare the phase of the detector oscillator. Then it should be simple to wire up digital logic for a logic high on detection.
hello I want to know protocol of send data on addressable fire detector until I can design devices with this protocol. I want to send and receive data on 2 wire and have +12 and gnd on that for detector at same time. thanks
Hello! I make digital phase detector for wander measuring. I have clock=2 MHz(with wander) and reference clock: clk=200 MHz without any wander or jitter. Here is circuit, which I try to write in Verilog: 60487 And here is diagram of circuit: 60488 Here is the Verilog code: modul
Hi, Please go through the link. I think this circuit will help you detect current. Invisible Broken wire detector Circuit Diagram Thanks, Suresh. I like to detect current passing through a wire. I have only a very small opening (15-20m
Place a coil of wire nearby, one which is suitable to detect 45 kHz. It may work better if you make a parallel LC resonant loop (tank circuit). It will detect only 45 kHz. Amplify the waveform as needed. What kind of coil is suitable? Maybe 100uH. .012 uF for the capacitor, if you make an LC resonant loop.
It is a detector which allows you to detect alpha particles in the air at atmospheric pressure. It consists of two parallel electrodes: one in the form of metal sheet and the second made of thin wires. This kind of d
Is the voltage AC or DC? Is the voltage contained in a sheathed wire or exposed wire. How close do you want to be to the voltage?
High, Could somebody help me do this please, Basically I want to be able to tell when a wire is live with 230 volts and print on an LCD "ON", I can program this when a port on the microcontroller goes high, but I need an interface between the port and 230 volts. Hope this makes sense Thanks In Advance Rizzy
hello, i designed an edge detector in verilog. it's RTL seems correct, but in simulation the output pulse is delayed. The examples on the internet, the pulse starts exactly with the rising edge of the clock signal. i used no delay in simulation. capture from the simulation 88415 and the code module re_detector(
OK Now, for the schematic. I have a couple of questions. RX: == What's the wire thickness for L3, L4, L5? Decoder: ====== What are typical resistor values for the joysticks and R5, R6, R7, R8, C6, C7, C8, C9? ASIC
You can place a piece of wire along the tube. It will receive wide-band rf noise if tube is working. If lamp is broken it will not radiate steady rf noise. Or even better - connect any contact of lamp to your rf sensor by little capacitor (3-5 pF will be enough). Capacitor will not pass 50/60 Hz AC, but will pass RF noise to your detector. Also
This is the ancient name for silicon, germanium, galena, and schottky diodes. It comes from the old days when a metal wire was mechanically touched to the galena crystal.
Here is the general receiver layout. From left to right (the standard way to draw scnematics or block diagrams indicating the signal flow.) antenna input, band pass filter, diode in series, load RC network in shunt, low power amplifier to get the 10 ms pulse, comparator to detect the pulse and produce a logic level to trigger your transmitter.
If this is a one of a kind system, you can make your own transmitter and receiver. For the transmitter use a microprocessor crystal in an inverter oscillator. Follow this by an AND gate. One input is from your oscillator. The other input is low for no signalling, and one of two different audio frequency square waves for a transmitted data o
The cheapest thing you can do is use an AM MW band receiver tuned to an empty frequency and an oscillator with a wire as the transmitter. Have a tone detector at the receiver output and turn the oscillator on and off at the tone frequency.
There are different types of smoke detectors considering how they must be connected. Basically they are: 4 wires 2 wires Addressable Addressable analog well I believe a good start point is to try 4 wires first. These use 2 wire for power and 2 wires for signal. In order to do a (...)
If you are testing a transmitter, you can use a diode detector crystal set. Put your receiver antenna next to the transmitter antenna. Then use an oscilloscope to look at the diode output. To build this you go from left to right: antenna wire, inductor to ground, diode to the output node, shunt capacitor and resistor to ground on the output n
The crystal radio receiver (also known as a crystal set) is a passive radio receiver consisting of a variable LC tuned circuit, a diode detector, and audio transducer. This is the original, and simplest type of radio receiver in existence. Such apparatus was in very wide use during the early history of radio and is still in limited use today. Cr
the most simple project to start with is PSTN to GSM router you have one input line and two output lines two output lines : fixed wirless terminal (GSM TO PSTN) PSTN Line if the user want to talk to PSTN number then the router will route the call to pstn output line else the router will route the call to gsm line if you need more infrom
You can just use a loop of wire for an antenna, a ~ 20 dB gain amplifier chip, and a schottky diode detector with a voltage storage cap at the output. If you push the button and the DC output voltage changes, you have "a signal". But that does not really test anything. If the frequency is off, the keyfob will not work. If the digital modulati
Thank you Kral, I started with a 5 Watt Resistor and that one died within seconds. A 10 watt resistor got warm and eventually died. When I went to a 50 watt wire wound resistor, I had no more problems. I am still looking to find a way of calculating the wattage depending on the size of the capacitor. I know, if I use a 0.01 uF Cap, the lo
Hello all, I just joined, and this is my first post. Background: assembled and soldered some kits, when I was young. I am 38 now. I designed a set of PC boards last year, for a mixture meter, that I was given schematics for. Turned out great, so far. Project: I am wanting to design and build a "christmas tree" for my church. Yes, this i
- Current transformers are are just transformers, the output is AC .. - Only one wire .. To make it working you have to use AC-to-RMS converter, or, as it is sine wave, (active) peak detector and divide the result by √2 .. Regards, IanP
Opens and shorts in a cable can be located using a TDR (Time Domain Reflectometer). You can make a pretty good substitute using a square wave generator and an oscilloscope. An example is shown at . You can also find used telephone company TDR's available for sale on eBay. The basic idea behind the
Hi gang, I have a question about charging 2 cell phone batteries with one wall charger. I have 2 cell phone batteries and the wall charger that is for those batteries. I know that if I connect the 2 batteries in parallel, the charger will fully charge them in about 6 hours. I want to use the 2 batteries connected in series to power a circuit.
Hi gang, again I need your help. The objective is: the main motor will be going forward. When that motor is going forward, the second motor will do nothing. When the main motor reverses, the second motor needs to turn ( doesn't matter which way it turns) For the life of me I can't figure out how to wire in the second motor. A little info
How can I measure the impedance of a small coil like the attached photo? Coil is 2mm coper wire located inside a quartz tube (4 mm diameter for water cooling). Coil diameter is 2.5 cm and lenght is 2.8 cm both like this and while plasma is ignited and coil is
Anybody who has an idea on how to create an AC sensor that would detect AC voltage on a wire, upon detection, the sensor would be outputting a DC voltage level? Or is there an AC sensor sensor (either non-contact or with contact) that would function in that manner. I've seen a lot of non-contact Voltage detector on the market but can someone hel
If you don’t have access to the neutral wire you can try to use the EARTH, as in many countries the Neutral and Ground (or "Earth") wires are tied or linked together at the building's incoming power main breaker panel .. Rgds, IanP
You need something like a PIR detector. Alternatively, you can wire two sensors inside the doorway and check the outer one operates before the inner one to indicate someone has entered. If the inner one operates before the outer one, someone has left. You could use interrupted light beams for this. Brian.
You almost built it with that description alone. 1. Antenna - well, it's in an anechoic chamber so you don't need to worry about filtering out interference! Probably a few cm of wire will do. 2. MMIC - a four pin amplifier, two of which are ground. Connect the antenna to the input, a resistor between the output pin and supply line and...