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Metal Detectors / Sensors

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Sensors / Detectors -- Main Page
 

Last Updated: October 24, 2017 02:55 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

New CCO Metal Detector -  Thomas Scarborough has designed a new embodiment of the CCO (Coil Coupled Operation) metal detector, a new genre which I invented in 2004.  I believe that this is the first IC design to appear on the internet (there is a transistor design on many websites, and IC designs were published by Elektor and EPE).  it took me just eight minutes to design this -- which illustrates the simplicity of the principle.  OBSERVATiON: On the surface of it, it may look like an iB (induction Balance) detector -- but it is not.  it works on the principle of the transformer coupled oscillator (TCO) , and requires an__ 

PicoDetector : a PIC-based Simple Circuit & cheap metal Detector -  The idea of this circuit is to hack PIC  oscillator circuit, by replacing the crystal by a coil : the frequency of the oscillator then depends on presence of metal near the coil, just like in a classic metal detector.   __ Designed by Bruno Gavand

Pictures of My Pulse-1 & 2 Metal Detector Project -  These Detectors have been Built by Various Persons, And I included their Comments on it's performance.   __ Designed by G.L. Chemelec

Poor Man's Metal Locator -  it uses just five circuit components, is easy to build and works on the "beat balance" priciple for good sensitivity.__ SiliconChip

Pulse Induction Metal Detector part 1 -  Experimental system for overcoming magnetic viscosity effects. __ Designed by JA Corbyn

Pulse Induction Metal Detector part 2 -  The bandpass amplifier in Fig.11 extracts possible signals for the background noise caused mainly by transients in the circuits. __ Designed by JA Corbyn

Simple Circuit & Cheap Metal Detector -  The idea of this circuit is to hack PIC  oscillator circuit, by replacing the crystal by a coil : the frequency of the oscillator then depends on presence of metal near the coil, just like in a classic metal detector.   __ Designed by Bruno Gavand

Simple Circuit BFO metal Detector -  Not the best, but Simple, and Now with a PCB.   __ Designed by G.L. Chemelec

Simple Circuit BFO Metal Detector -  BFO (beat frequency oscillator) metal detectors use two oscillators, each of which produces a radio frequency.  One of these oscillators uses a coil of wire that we call the search loop.  The second oscillator uses a much smaller coil of wire, and is usually inside the control box and is called the reference oscillator.  By adjusting the oscillators so their frequencies are very nearly the same, the difference between them is made audible as a beat note __ Designed by Essex Metal Detectors

Simple Circuit BFO Metal Detector -  This simple BFO metal detector requires only a few of components and an evening's work.  The two oscillators are simple Colpitts designs using BJT transistors.  The reference oscillator's frequency is approximately 370kHz, slightly tunable with the help of a silicon varactor diode.  The outputs of the two oscillators are fed to a mixer made with Q3 and Q4.  The signal then goes through a low-pass filter (R13, C13) and a JFET preamp.  The LM386 audio amplifier has a gain of 20, more than enough for most headphones.  if you need more gain, you can add a 10uF capacitor between pins 1 and 8.__ hobbyteam @ hobby-hour.com

Simple Circuit metal Detector based on a PIC12F683 microcontroller -  The idea of this circuit is to hack PIC  oscillator circuit, by replacing the crystal by a coil : the frequency of the oscillator then depends on presence of metal near the coil, just like in a classic metal detector. __ Designed by Bruno Gavand

Simple Circuit metal Detector Electronic -  All the parts for the PC board, PC board, battery and winding wire $10.00  including pack and post. You will also need an AM radio, base-board to mount the parts and a wooden handle approx 1.5 metres long. __ Designed by Collin Mitchell

Simple Circuit VLF, PI & BFO -  Metal detector theory - Metal detectors are used in a wide range of applications from landmine detection to safety in airports, office buildings or schools.  They can also be useful around the house to help locate lost coins, jewelry, keys and gas lines.__ hobbyteam @ hobby-hour.com

Simple Metal Detector -  Two transistors and a LM386 make a simple metal detector suitable for finding coins. __ Designed by Steve Hagerman

Single Chip Metal Detecor -  A single chip metal detector with a range of a few inches.  This is useful for decting nails or screws in walls and floors, or for locating buried mains cable.   __ Designed by Andy Collison

Testing Metal Detector Coils -  I Decided to Check my coils for inter-wire and Total Capacitance.  it is a Well Known fact that internal Capacitance in a coil reduces its frequency response.  in the Tests Below, The coil Lead Lengths on all coils was about 5 inches.  No Coax cable used __ Designed by G.L. Chemelec

The "Matchless" Metal Locator  -  it's cheap, its easy to build and it could find a fortune.__ SiliconChip

Two-component metal Detector -  The circuit shown must represent the limits of simplicity for a metal detector.  it uses a single 4093 quad Schmitt NAND IC and a search coil -- and of course a switch and batteries.  A lead from IC 1d pin 11 needs to be attached to a MW radio aerial, or should be wrapped around the radio.  if the radio has a BFO switch, switch this ON.  Since an inductor resists rapid changes in voltage (called reactance) , any change in the logic level at IC 1c pin 10 is delayed during transfer back to input pins 1 and 2.  This is further delayed through propagation delays within the 4093 IC .  This sets up a __ Designed by Rev. Thomas Scarborough

Two-component metal Detector using a 4093 -  The circuit shown must represent the limits of simplicity for a metal detector.  it uses a single 4093 quad Schmitt NAND IC and a search coil and of course a switch and batteries.  A lead from IC 1d pin 11 needs to be attached to a MW radio aerial, or should be wrapped around the radio.  if the radio has a BFO switch, switch this ON. __ Designed by Rev. Thomas Scarborough

White's SurFMaster PI (pulse induction) metal Detector schematic diagram -  White's Surfmaster PI is a good quality, fully waterproof, lightweight metal detector with an exceptional depth in saltwater or mineralized ground.  it's ideal for those wishing to search beaches, in the surf or shallow diving.  it works inland too, but such use is not advised as -- like all PI (Pulse induction) designs -- there is no effective discrimination of ferrous objects.  Runs on eight AA size batteries. __ Contact hobbyteam @ hobby-hour.com

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Metal Sensors / Detectors / Monitors   #'s - H      I - M      N - Z

 


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