Category | Price | Seller | Device |
---|---|---|---|
Utilities | Free | Dmitriy Kharutskiy | iPhone, iPad, iPod |
THE "VERY SIMPLE" METAL DETECTOR IS PERHAPS THE SIMPLEST SCHEME OF AN ACTUAL, WORKING METAL DETECTOR, FOR IT ONLY CONSISTS OF AN LC CIRCUIT AND TWO RESISTORS IF YOU DON'T COUNT IN THE IPHONE :).
The main part of the device is the LC circuit. The stability of its parameters is very important. They constantly fluctuate with the slightest changes in temperature. Moreover, the inductance changes with the slightest changes in the geometry of the inductance coil. These changes are constantly being adjusted by the application. The parameters of the internal iPhone circuits and the headphone jack adapter can also fluctuate, but they stabilize after approximately a minute after turning on the signal.
Frequency range is 3-14 kHz. It is possible to choose the frequency by choosing the capacity of the condenser in the LC circuit. After a change in capacity or inductance, on the first start, or when a change in air temperature occurs, you need to enable the search for the resonance frequency.
Searching using a metal detector isn't as easy as it might seem and might sometimes be deadly. Therefore, it is necessary to study this subject on specialized sites. Be sure to do some experiments with a coin placed on the ground.
FREE VERSIONS OF METAL DETECTORS ARE LIMITED BY THRESHOLD OF THE SOUND SIGNAL AND THE INDICATOR LIGHT. WHICH MEANS THAT IT'S POSSIBLE TO DETECT THE METAL BY THE NUMBERS ON THE IPHONE'S SCREEN, BUT IT CANNOT BE HEARD OR SEEN IN PERIPHERAL VISION IF NOT LOOKING DIRECTLY AT THE SCREEN.
"Very simple" metal detector (WITHOUT CHIP):
• Coin: 4 inches (10 cm)
• Small shovel: 6 1/2 inches (16 cm)
• Discriminate between metals
"Sensitive" metal detector:
• Coin: 6 1/2 inches (16 cm)
• Small shovel: 9 inches (23 cm)
• Discriminate between metals