Metal Detector Circuit using IC 555 timer Circuit

Metal Detector Circuit

A Metal Detector circuit is made by using IC 555 timer a common device used to check people, luggage, or bags in shopping centers, hotels, cinemas, etc., to ensure that a person does not carry metal or illegal things, like cannons, bombs, etc…

IC 555 Timer Pin Diagram:

IC 555 Timer Pin Diagram

Generally, this IC 555 Timer discover by “Signetic Corporation” and is denoted with SE or NE555 timer. Generally, it is used for timing circuits which gives highly stable time delays or oscillation. These ICs are very economical and reliable in cost compared to OP-Amp applications in the same manner.

555 Timer Applications:

  • These 555 timers are used as astable and monostable Multi-vibrators in digital circuits.
  • DC-DC converters
  • Used in tachometers.
  • Analog frequency meters.
  • Voltage Regulators.
  • Temperature control and measurement devices.

metal detector circuit diagram

Metal Detector circuit

 Metal Detector circuit is frequently found at airports, theatres, and various other public places. They are used for the safety of people to detect anyone carrying a metal. In this project, we are going to design a  metal detector circuit. There are so many metal detector designs but most of them are complex in design so here we are going to design a simple metal detector circuit using 555 Timer IC.

How to Make a Powerful Metal Detector Using BC547 Transistor:

The above circuit shows a schematic diagram of the Metal Detector. IC 555 timer here it acts as a generator and generates rectangular wave pulses with audible frequencies for humans. The capacitor between terminal 2 and terminal 1 should not be altered as necessary to generate the sound frequency.

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Working of Metal Detector Circuit:

  1. The 555 IC is wired as a Monostable multivibrator.
  2. A monostable multivibrator is characterised by giving a high output when there is a low pulse signal to the input trigger pin.
  3. The duty cycle of the output pulse from IC 555 is proportional to the Inductor L1 and Capacitor C1 which is connected in series to the trigger pin of IC 555.
  4. Here the inductor we use is an Air core. When current flows through the Inductor a magnetic field is proportional to the current flow that develops around it.
  5. This magnetic field senses when metal is brought near the inductor its inductance increases. This results in an increased inflow of current and the Capacitor starts charging quickly.
  6. Feeding the trigger pin of IC 555.

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