Vlf Metal Detector Circuit

Concealed metallic objects such as metal foils enclosed in a plastic cover e g toothpaste tubes and small objects like refill tips made of magnetic materials too can be detected using this circuit.

Vlf metal detector circuit. They are ib induction balance detectors using very low frequencies. Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced. Pulse induction metal detector gold mining equipment motorcycle wiring metal detecting control valves technology metal detector rolodex circuits. Described here is a simple metal detector circuit that can detect metallic conductors in its vicinity up to a range of 25 to 30 millimetres.

Phase shift provides vlf based metal detectors with a capability called discrimination. When the metal detector circuit is placed near to a metal object the inductance of its coil changes and so do the frequency of oscillations. This is the vlf receiver circuit that i ve upgraded and modified it senses ac fields lightening and even receives ship and aircraft radio too. Diy sensitive vlf metal detector with smartphone detects a small metal coin at 25 cm and pot lid at 1m distance.

And the best part is that it is very simple and can be made by anyone who h. Vlf metal detector circuit. Since most metals vary in both inductance and resistance a vlf metal detector examines the amount of phase shift using a pair of electronic circuits called phase demodulators and compares it with the average for a particular type of metal. I ve even used a gravity wave detector circuit added to it and also other experimental circuits.

This means a metal object is detected. Now the two frequency will be different there will be no cancelling and the radio produces a hissing sound. Metal detector circuit diagrams and projects note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy. Now this is what the circuit looks like without the upgrades and modifications.

Very low frequency vlf detectors are the most versatile metal detector types based on the range of metallic objects you can find with them. Building a deep detector is an art. This is impossible for 90 of the mass produced detectors. As all ib designs the vlf detector combines two balanced coils.

This metal detector is capable of detecting small metal objects at great distances. The limit of a good metal detector is about 30 cm in soil with low mineralisation for 1 euro coin.