Although the metal detector circuit with the 555 timer integration is simple, it works very well. According to many metal detector circuits, the electronic component is not used, but the coil part of the detector needs a little thin workmanship.
There are 2 555 timers in metal detector circuit. In addition, passive components use 9v battery as power source. Detector coil is nailed to a board for winding of a coil and coiled around enamel wire and coiled. Control coil is connected to control circuit with shielded cobles. External coil of shielded coble is connected to chassis. is connected to the switching part of the coils
METAL DETECTOR SCHEMATICS
METAL DETECTOR CONSTRUCTION CIRCUIT
The thickness of the wire used for metal detector coils is 0.3mm but the writer is using 0.7mm. The radius of the circle prepared for winding is 15cm … 16cm and the number of turns is 25 (15.5cm) after wrapping is wrapped with paper tape or electric tape
How the metal detector works with the coin in the test image of the detector