Metal Detector Circuit Using BC547 Transistors
This simple electronic circuit is a basic metal detector built using three BC547 NPN transistors, an LED, a buzzer, a resistor (330Ω), a copper wire coil, and a 12V battery. The copper coil acts as a sensor: when it detects the presence of metal, it changes the magnetic field, triggering the transistors. This activates the LED and buzzer, providing both visual and audio alerts. It is a beginner-friendly project for understanding how transistors can be used in detection circuits.
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