Monday, 17 July 2017

Metal Detector

                               
This metal detector can be used to detect metallic objects. Sensing coil is used to detect metals. This coil should be kept near metallic objects for detection. Sensing coil forms parts of tuned oscillator. Input of circuit is a weak colpitt’s R.F. range oscillator.

Working:
When coil is brought near a metallic object magnetic energy is absorbed and oscillator fails to work then transistor Q4 conducts and buzzer is activated. Use a 9 V battery. After connecting battery, adjust the 4.7K preset till circuit just stop sounding.

Block Diagram:





Circuit Diagram:


 Component Part List:
1
 1. Resistors


 2. Capacitors:


3     3. Diodes:


 4. Transistors:


       5. Miscellaneous:




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