simple metal detector on seven silicon transistors

simple metal detector on seven silicon transistors

simple metal detector on seven silicon transistors

The metal detector allows to detect any metal object at a distance of up to 20 cm. The detection range depends only on the area of the metal object. For those who do not have this distance, such as treasure hunters, you can recommend to increase the size of the frame. This should increase the depth of detection.
Detector concept
The circuit is assembled on transistors operating in a mode of microcurrents, and consists of HF generator (100 khz) on VT1 which is adjusted by the R1 resistor on maximal sensitivity to metal subjects.

The basic scheme of simple improvised metal detector on transistors.



Two frames are used as coils L1 and L2 (Fig. 2). Transistors VT2, tz are included as diodes and provide stabilization of modes of the Autogenerator-VT1 and active detector on VT4 at change of a supply voltage and temperature.

The R6 resistor sets the sensitivity of the detector. On transistors VT5 and VT7 the sound autogenerator which is switched on transistor VT6 is assembled. In order to provide loud sound hf1, parallel to it the coil L3 is included.

This increases the voltage by resonance between the internal capacity of the HF1 and the inductance L3. When entering the field of coils L1-L2 metal Object The frequency of the generator changes, which leads to a decrease in the voltage amplitude at the entrance of the detector (VT4). It locks, and the VT6 transistor opens, which allows the operation of the sound generator.

This scheme, compared to similar devices, using the principle of beating frequencies, provides greater sensitivity and easier to manufacture.

Details and Design


A battery of the type "corundum" or "krona" (9 V) is used as a power supply, but any stationary source with a voltage of 6 - 10 V can be applied. Current of consumption in the standby mode no more than 1.5 ma, at work of a sound signal - 7 MA.

Simple detector design on transistors design.



All elements of the circuit can be placed on a printed circuit board of one-sided. Case for a frame it is necessary to make from any dielectric materials, for example, to glue from Plexiglas.

The L1 and L2 coils should be identical and contain 40 + 40 turns of wire PEL diameter 0.25 mm (perimeter of coils 340 mm).

The L3 coil is wrapped on two rings of 400-1000 nm type, which are glued together, and contains 250 - 300 coils of the wire PEL diameter 0.1 mm.

The built-in resistors R1 and R6 should be of type SP 5-16, the rest can be any small-sized. Capacitors C7-Type to 50-35 on 16 in, others-type to 10-17.


Printed Circuit board homemade detector.



The VD1 diode can be replaced by any pulse. Microswitch SA1 type DD-9-2.

When setting up the device, if you can not get the generation on the VT1 by adjusting the R1 resistor (you need to control the oscilloscope voltage on this resistor), you need to change the connection phase of the output of the L1 coil.

When adjusting the circuit to the maximum sensitivity to metal objects may need to change the overlap distance of coils "a" , after which the frame of coils should be fixed with glue.
How To Make a Homemade Metal Detector
Make a Homemade Metal Detector

The process of creating your own detector cheerful and instructive. If you know how to make a metal detector with your hands at home, you can not only save thousands on its acquisition, but also enriched, finding the treasure.
Homemade Metal Detector Without Radio
Homemade Metal Detector Without Radio

make your own metal detector make a metal detector radio calculator metal detector, Any of these two suggested methods will help to make a simple working metal detector with your hands at home. Without complicated schemes and serious efforts and costs. .
How to make homemade metal detector
How to make homemade metal detector

Do you like to look for lost treasures? If this is the case, a metal detector will do! But don't break your wallet by purchasing a high end metal detector. Learn how you can now make your own homemade metal detector!.
Homemade Metal Detector Simple & Sensitive
Homemade Metal Detector Simple & Sensitive

How to make a metal detector from a magnet How to make a metal detector from a calculator How to make a metal detector from the radio How to make a metal detector from your phone.
Simple metal detector on two chips NE 555
Simple metal detector on two chips NE 555
Simple metal detector on two chips NE 555, How to make a simple metal detector. Can you find the gold hidden underground with this metal detector?
simple vlf metal detector circuit
simple vlf metal detector circuit

best vlf metal detector simple metal detector circuit vlf metal detector arduino what is a vlf detector vlf vs pi detectors bounty hunter vlf metal detectors metal detector circuits projects metal detector circuit diagram.
Accessories for detector and other useful
Accessories for detector and other useful
They are especially useful when working in places where strong noise
(motor transport, sea surf, Storm River, etc.)
Through metal detectors will be held in the school children
Through metal detectors will be held in the school children
Soon the students will begin to pass through metal detectors at the entrance to the schools.
DIY Metal Detector Plans
DIY Metal Detector Plans
Metal Detector Circuits Plans To Build a Metal Detector Schematics Professional Metal Detectors Instructions To Build a Metal Detector Circuit Diagram For a Metal Detector.
Homemade Metal Detector Plans
Homemade Metal Detector Plans
Homemade Metal Detector Homemade Metal Detector Circuit How To Make a Homemade Metal Detector Homemade Metal Detector Simple & Sensitive
Pi Metal Detector Schematic
Pi Metal Detector Schematic
Explanations and lessons and videos about Pi Metal Detector Schematic with simple and sensitive tools enable you to make a metal detector and find gold.
Homemade Gold Detector
Homemade Gold Detector
Professional Gold Detector Gold Seeking Metal Detectors A High Quality Gold Metal Detector Digital Gold Detector Long Range Underground Gold Detectors.
Radio Calculator Metal Detector
Radio Calculator Metal Detector
Metal Detector Reviews Plans To Build a Metal Detector Best Rated Metal Detectors Metal Detector Comparison Chart Metal Detector Ratings Make Your Own Metal Detector.
DIY Metal Detector Kits
DIY Metal Detector Kits
Build It Yourself Metal Detector Instructions To Build a Metal Detector Building a Metal Detector Plans To Build a Metal Detector Complete Circuit Diagram Of Metal Detector.
Radio Calculator Metal Detector
Simple Metal detector using 555 IC
but what some do not know is that it is possible to prepare this device at home, and that Using simple tools.
How the frame detectors work in the subway and railway stations
How the frame detectors work in the subway and railway stations
Metal detectors, simply put, the framework that we see at airports, railway stations and in the subway, can catch any dangerous substances and objects.

How to Make 10mH Coil for Metal Detector
How to Make 10mH Coil for Metal Detector
In order to create your own, you must have enough wire to make the file,-wire for metal detectors, which includes the design of the search file.
Find gold with a homemade detector
Find gold with a homemade detector
You should not expect a commercial metal detector and that you should not expect to find gold with it.
make a DIY mini metal detector
make a DIY mini metal detector
While building a conventional metal detector may require a set or in-depth, a more famous way is to use a calculator and a radio device to make a metal detector.

How to make a DIY metal detector
How to make a DIY metal detector
This metal detector has won the fame of a simple and not expensive device, a small number of available parts, with proper assembly and correct parts of the device works immediately, almost without settings. 
How to make simple metal detector at home
How to make simple metal detector at home
Today we know a large number of ways to make a metal detector at home completely independently, without the help of specialists.
Simple Metal detector on transistors
Simple Metal detector on transistors
In this article we will talk about one of the simple detectors, the assembly of which can be carried. These include transistors with CT and MP marking
How to make a simple metal detector
How to make a simple metal detector
In this project we are going to design a simple metal detector circuit. Today we know a large number of ways to make a metal detector at home completely independently.
Simple metal detector on two chips NE 555
Simple metal detector on two chips NE 555
Simple metal detector on two chips NE 555, How to make a simple metal detector. Can you find the gold hidden underground with this metal detector?
Simple Metal detector using 555 IC
Simple Metal detector using 555 IC
but what some do not know is that it is possible to prepare this device at home, and that Using simple tools.

spy cameras in hotel rooms
spy cameras in hotel rooms
Discovering a hidden camera in the air bedroom raises the privacy concerns of the vacationers. Hotels can harbour many secrets.
dig gold with homemade metal detector
dig gold with homemade metal detector
Homemade drilling tools.  Found with metal detector, macro gold Racer test speed recovery. Learn what is the best gold for mineral exploration. Find the best metal detector products.
Creative Homemade Metal Detector
Creative Homemade Metal Detector

How to build a metal detector for PI pulse induction from a DIY collection. Technology-construction-how to make a metal detector cheap and simple.
How to make a metal detector in 3 steps at home
How to make a metal detector in 3 steps at home

While the construction of a conventional metal detector may require a set or in-depth, a more famous way is to use a calculator and a radio detector to make metal detectors.
How to Make a Metal Detector At Home Easy Way
How to Make a Metal Detector At Home Easy Way

The fastest way to detect metals is to use a magnet field on your smartphone. A more famous way is to use a calculator and a radio device to make a metal detector. .
Smartphone Homemade metal detector
Smartphone Homemade metal detector

Turns your cell phone into a metal detector, and makes people with iPhones jealous. The metal detector is located in the third set of the gadgets collection.

How to make a hidden wiring indicator
How to make a hidden wiring indicator

When performing construction work, there is often a need to check the wall for the presence of wiring in it. A detector that reacts to metal is needed to perform the search.
how to make gold detector
how to make gold detector

In our time is a very popular search various artifacts, jewelry, More and more people want to reveal ancient secrets or find a real treasure. For centuries the most common noble precious metal was gold. The most appealing are the jewelry of gold as well as gold bars and coins.
Simple metal detector on silicon transistors
Simple metal detector on silicon transistors

Metal detector is intended for detection of metallic object (well cover, pipe cut, concealed wiring).
Improvised metal detectors diagrams and descriptions
Improvised metal detectors diagrams and descriptions

Metal detector is an electronic device for searching and distinguishing metals, objects from metal, which can be hidden at different depths under a layer of sand, earth, in walls of premises and various constructions.
homemade metal detector digging tools
homemade metal detector digging tools

Homemade drilling tools. One shovel surprised, have you ever seen a shovel with an arm's armrest and an enlarged handle This is a new drill tool including Adate
homemade gold detector circuit
homemade gold detector circuit

Metal Detector Circuit Description This is the circuit diagram of a low cost metal detector using a single transistor circuit and an old pocket radio.This is nothing but a Colpitts oscillator working in the medium frequency and a radio tuned.