Metal Detector

Product Code: MD
Product Condition: New
Units in Stock: 10


This is metal detector circuit board electronic DIY Components kits, this item can detect any metal,coin,stainless any thing which is made by  metal,about 2.5-4cm distance for sensor to detect the metal depending on how big is the metal, if it is small size, it can detect about 2.5cm, for example a coin.Delivery 30 days.


Name: Metal Detector DIY kits (MD)
1.Power Supply: 2 * 1.5V AA Battery (NOT INCLUDED )
2.Detection distance: 2.5-4cm depend on size of metal
3.Buzzer alarms when sensor  detects  metal


1.Away from the metal,it stops buzzer,One  should adjust a little by potentiometer anticlockwise direction and try it again.
2. Changing  C5 capacitor can  change the frequency of the sound.

Operating principle:

1.Q1, L1, L2, C2, C3, R1, W compose high-frequency oscillation circuit, adjusting the potentiometer W, can change the oscillation gain, the oscillator is in the critical state of oscillation, that is to say, just make the oscillator start up.
2.Q2, Q3 detection circuit,when the circuit is in normal oscillation, Q2 in conduction, Q3 stop; When detecting coil L1 nears the metal objects, it can produce eddy current in metal conductors, thus energy loss increases from the oscillating circuit. Thus positive feedback is less, oscillation becomes poor, as it can't maintain the minimum energy required for oscillation and vibration. This makes  Q2 stop, Q3 to conduction. Q4, Q5 audio oscillator circuit causes a buzzer to make a sound.

Package included:

1 x Metal Detector DIY Components Kit with the assembly box

₹ 650 inc. tax

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