Simple metal detector on silicon transistors

circuit diagram
Homemade Metal Detector YouTube
simple metal detector
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).
Device diagram
The metal detector consists of a parallel voltage stabilizer (transistors V1 V2) at the generator of high (about 100 khz) frequency on the transistor V4, the detector of HF Oscillation (V5) and the amplifier of a direct current (V6, V7) with the indicator on the LED V8.

The high-frequency voltage from the L2 communication coil is rectified by the emitter transition of the transistor V5. This transistor will be opened when the generator is running and the V6 V7 transistors are closed. The V8 led does not glow. If you bring any metal object to the L1 coil, the oscillation of the generator loosest, transistor V5 closes, V6 V7-open, and the LED will glow.

Details
L1 coils, L2 reel a revolution to the revolution on a round ferriteing terminal from magnetic antennas of transistor radios. They contain respectively 120 and 45 coils of a wire PEV-2 in diameter 0.3 mm. The longer the rod, the sensitivity of the detector is higher.

Establishing
At adjustment of the device by the R5 resistors, R7 (the engine of the R6 resistor in the middle position) set the mode of operation of the generator so that it was on the verge of excitation (led still glows). Then the engine of the R6 resistor put in such position when the LED goes out.

If now priblivit the ferrite rod to the metal object, the LED breaks again. This operation should be repeated several times, seeking to find such positions of the tuning resistors R5 and R7 at which the maximum sensitivity of the device is reached.

Related Pages

Arduino Metal Detector
Homemade Metal Detector
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.