Metal Detector(Green Ver.)
A small metal detector without case.
Schematic Diagram and Component List
You will need the following components to complete this project:
200k Ohm Resistor
1
R1
2k Ohm Resistor
1
R2
470 Ohm Resistor
1
R3
LED Light
1
LED1
104 Ceramic Capacitor
2
C1, C4
222 Polyester Capacitor
2
C2, C3
100uF Electrolytic Capacitor
1
C5
9012 BJT
2
Q2, Q3
9018 BJT
1
Q1
100 Ohm Potentiometer
1
VR1
Buzzer
1
SP1
Terminal Block
1
J1
Self-lock Switch
1
SW1
Procedures
Place and solder the resistors.
Place and solder the capacitors.
Place and solder the LED light.
Place and solder the 100uF electrolytic capacitor.
Place and solder the BJTs.
Place and solder the buzzer, switch, and potentiometer.
Place and solder the terminal block.
Connect the power supply wires, be aware of polarity.
When power is on, start by adjusting the potentiometer until the buzzer emits a sound. Then slowly adjust potentiometer in the opposite direction until the buzzer just stops making sound. When metal object is in range, the buzzer will start to make sound again.
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