report on metal detector of 557 from vegakit

Metal Detector Project

This circuit is most useful for security checking. Metal Detector available in the market are quite expensive.

This metal detector can be used to detect slightly big size metallic objects. It used a sensing coil. This coil should be kept near metallic objects for detection. Input of Circuit is a week colpitt s R.F. range Oscillator. Sensing coil forms parts of tuned oscillator.

When coil is brought near a metallic object magnetic energy is observed and Oscillator fails to ....etc

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A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage. You'll see transformers at the top of utility poles and even changing the voltage in a toy train set.

Basically, a transformer changes electricity from high to low voltage using two properties of electricity. In an electric circuit, there is magnetism around it. Second, whenever a magnetic field changes (by moving or by changing strength) a voltage is made. Voltage is the measure of the electric force or pressure that pushes ele ....etc

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When electricity flows through the transmitter coil, it creates a magnetic field all around it. If you sweep the detector above a metal object (such as this old gray spanner), the magnetic field penetrates right through it. The magnetic field makes an electric current flow inside the metal object. ....etc

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i want vegakit 557 metal detector circuit diagram and working.
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Vodacom USSD Services

*100# Dial (Prepaid Only)

Balance Enquiry

(Balance displayed on handset)
100*01*Recharge PIN# Dial (Prepaid Only)

Recharge of prepaid account

(Account topped up with voucher value)
*100*02# Dial (Prepaid Only)

Check data bundle balance

*111*502#

Less verbose bundle balance

*111*500#

MSISDN query (retrieve own number)

*111*501#

Time Window Enquiry

(Time Window Expiry date displayed on handset)
*141*777# dial (Contract & Prepaid)

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A metal detector is an electronic instrument that detects the presence of metal near. Metal detectors are useful for finding hidden metal inclusions inside objects, or metal objects buried underground. They often consist of a handheld unit with a sensor probe that can be swept over the floor or other objects. If the sensor approaches a metal part, this is indicated by a changing tone on the headphones or a needle moving over an indicator. Usually, the device gives some indication of the distance; The closer the metal is, the higher the pitch in ....etc

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