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# Metal Detector Circuit

34 Threads found on edaboard.com: Metal Detector Circuit

## Auto calibration for DFMD

Hi, Would you please tell me the circuit diagram of automatic tuning/auto calibration for DFMD (Door Frame metal detector)? A beginner level explanation would be highly appreciated. Thanks & Regards.

## walk-through metal detector

What is your proposed Schematic for this metal detector? How Small of metal do you expect to detect and at What Distance?

## Opamp Circuit for metal detector

Hi, I have seen a circuit as attached for metal detector. Can anyone please explain me what is basic functionality of the opamp in that circuit arrangement. Pin2 is going to the input (-)of another opamp. Please explain me the functionality of this type of circuit. Thanks.

## ac cable locator when load is not connected to the wire

use a metal detector (copper in cable!!) Frank Professional cable locators use an audio tone generator to inject signal into a cable, and an audio amplifier with a speaker that can detect cable presence under building material, by a small capacitive probe. No AC or other current needed, only a capacitor couplin

## Help with Metal detector circuit

I need help understanding this metal detector circuit. The values for different components are R1,R4-56K R2-3K3 R3-22K R5-2K7 R6-2K2 R7,R9-680E R8-15K P1-5K pot C1,C6-.1pF(104) C2-1kpF(102) C3-220pF C4-270pF C5-12kpF c7-100uF The diodes are IN4148 signal diodes, but they are connected in reverse bias(I do not understand why) (...)

## single power supply + communictaion

Hi everyone, I've build a metal detector circuit using a 555 timer as explained in this link: al-detector-using-555-timer.html instead of using a speaker as the informer of detecting I am checking the frequency at the point were the speaker is shown in the diagram. The frequency is measured by

## metal detecting circuit

I don't think that this method would give very good results,. You have not shown the search coil, this is perhaps the most important part of a metal detector design. in total agreement was an idea, and maybe not a great idea

## Inductive proximity switch

Search for metal detector circuit.

## Metal detector to PIC16F877

You should design the metal detector circuit such that it gives 5V O/P by turning on a transistor when metal is inserted. If there is no metal it should give 0V o/p i.e., transistor turned off. Then you don't have to use ADC to read the analog voltage. You can use Digital i/p to read the 0v and 5v logic levels.

## design and implement metal detector

Remember CIVIL. Vertical vector = Ic, so Vc lags by 90 degs (inductive off resonant circuit), Vc across Cc-e, causes Ie to lead by 90 Degs, so is in phase with Ic and away it goes!!!!! can't see how this will detect metal? Frank

## Analog circuit design Project topic suggestions needed!

How about a metal detector? You never think you need one until you drill a hole in the wall and hit a water pipe.

## Tiny Ohmmeter + some optional extras.

It would be easier to use a ceramic emitter with a current controlled one shot and let it squeal like a metal detector for short circuits and click slowly for leaky circuits and nothing when open circuit.

## Metal 'discriminator?'

BFO metal detector will discriminate metals. You can search for "BFO metal detector circuit" by google and start to test it.

## metal detector using LC circuit in resonance

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 (...)

## PI metal detector using ATmega8

Hello. I am looking for a PI metal detector circuit schematic using the atmega8 micrcontroller. Could anyone help me with this?

## metal detector circuit

i really dont know why you are repeating the post... this will lead to infraction and your post will be deleted.... any how check this metal detectors - Theory and Practice - VLF, PI and BFO Schematics ---------- Post added at 22:45 ---------- Previous post

## metal detector circuit

hello please send me metal detector circuit using induction coil ,,,,, end please tel some summery about circuit

## Colpitts oscillator metal detector

Hey I've built a metal detector using a colpitts oscillator. I used two 1uF capacitors in series. I've been measuring the voltage output from the center tap of the two capacitors. When I bring metal close to the coil, the amplitude of the oscillations goes down to zero. Can anyone please explain why this happens? Someone told me that it (...)

## Need Help Understanding a Metal Detector circuit

This is the Eti 549 metal detector circuit I'm referring to. I'd really appreciate it if someone could guide me and tell me what's exactly happening in the transmitter section. The first stage is a relaxation oscillator producing 800 Hz which is being fed into the next stage, which is a Colpitt's oscillator, which modulates the signal to 130 (...)

## Looking for a simple coin detector circuit

Hi, yes metal detector. I consider any analog output from the circuit and using ADC + microcontroller to detect the coin. I need a simple circuit only. Just for hobbies. TQ.

## circuit diagram for metal detector

Here is the Magnum metal detector: By today's standards it may look a little bit old-fashion, but it is well documented and easy to build .. IanP :D

## Simple circuit for Metal Detector

You have two options: simple unit or one that works .. I prefer the latter .. So, here is detailed description of MAGNUM metal detector .. Funny thing about it is that you can use a couple of plastic plates from you kitchen as bases to construct the coils .. Rgds, IanP :D

## sense black mark in the rotating silver color metal disk

Hi All, Actually I want to calculate the No of rotations by sensing that Black mark. So pls tell me about the suitable sensor for that? Give me details of common sensor in the market. Thanks....

## Various metal detector circuit diagrams

i am going to start a project of metal detector.i need help for it .can i get any circuit diagram n description of this project that how it works?its really urgent

## metal detector for coin

does anybody have a metal detector circuit with cpu?

## semi complex metal locator circuit on vero good for beginner

here is a design for a tesoro of the usa metal detector this italian/american company produced it several decades ago i made this design several years ago for a pal who runs a school electronics class i used lochmaster {brillient vero tool} and it was built successfully by 30 students that year and is still being used i

## Guys i am looking for Ultiboard software

I am designing a new circuit for a walk through metal detector, i have the multisim workbench and i want this Ultiboard software to do the PCB, as from the Multisim u can transfer a file to this software and it will draw the PCB as i understand, is that right, have anyone try it before. Plz let me know. From where to download this (...)

## RF motion detector for humans/animals

well now you're going into high tech, I wonder for a simple circuit like an AM emetter and a kind of big coil for receiver. I know that this is working for metal objects, not sure about humans or animals! flyhigh

## Is there a schematic circuit for the walk through metal dete

Guys could anyone have a related subject sites or links or anything concerning a walk through metal detaector, specially its schematic diagram could u plz pass it to me. This is not the metal detector that is used to detect metal or mine in the ground, i want the on that is used in the airport, and the embassies.

## pulse induction metal detector

This is a microcontroller pulse metal detector.

## how a metal detector works???

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 (...)

## Looking for a small touch sensor

Why don't you make your own touch detector??? Just a couple of metal or conductor plates... and you got it done. Open, no voltage (Open circuit), pressed, 5 v dc.

## req: EarthQuake Detector

The best i know is the one i used in my high school science fair project.. Is just a nail attached one end to metal spring ,as the one used in toggle pens. then a metal 'O' ring ,close about 1 mm ,and you have a good and sensible switch ...when it detects a minor movement or vibration nail touch the ring and close the switch.. I remember

## Metal detector - schematics needed

Hi Send a Private message to Simbox. He loves metal detectors, and I think he's the best person who can help you. Regards No Fear