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28 Threads found on edaboard.com: Wire Detector
Any RF signal in space around the cell phone or near a base station can be detected with a RF detector diode installed in a half-wave dipole (there are other sensors but this the simplest. You need a Germanium diode (1N34 or 1N60) or a Schottky detector diode (Agilent HSMS series_), and you can use a thicker copper wire (1 mm or 40 mil) (...)
Instead of a 10 mH coil, use a larger flat coil, like 50 turns of 0.5 mm dia.wire would on at least 6" diameter, in a tight strain. Detecting metals requires to affect the coil inductance by a larger metal mass. Using a small coil might only detect a magnet if it affects coil iron core. Better metal detectors use larger coils, also the beat-frequ
In order for Q1's bias wire to pick up the slightest signal, R1 must be very high ohms. R2 and R3 should be a potentiometer which you will adjust to a point where the led just starts to is not too different from the simple static charge detector (electroscope), using a
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
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?
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.
good ruck. got 40awg wire?
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
The clever way would be to get your vibration detector to increase the power supplies voltage. So the first thing to do is to investigate the power unit and discover if its possible to adjust its output voltage. Once you have done this, all you have to do is to wire the adjustment to your vibration detector. Looking at it a different (...)
hello I want to send +12 and GND and data on 2 wire . what should I do? this is for Addressable fire detector that I should send +12 and GND to detectors with Fire panel and I need read and write data to and from detectors (maybe RS-485), means I need send power and data on 2 wire . please help me (...)
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
if you dont want physical contact then why not use wireless???? explain your question please.
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.
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.
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
For temperature might easiest to use digital sensor with I?C or 1-wire interface. For vibration use acceleration sensors.
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
- 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
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!!!
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
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.
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
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 (...)
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.
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.
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.
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
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