hello
i have made a bfo shield board for arduino
the sensicity of the whole detector isn´t that would you should expect from a modern metal detector
every 5€ wall detector from supermarket works better
if you want to make a better desgin i think you should concectrate your work to a vlf unti but not more than 7Khz tx coil frequency (seperated tx and rx coil)
pcb layout
hello
i have made a bfo shield board for arduino
the sensicity of the whole detector isn´t that would you should expect from a modern metal detector
every 5€ wall detector from supermarket works better
if you want to make a better desgin i think you should concectrate your work to a vlf unti but not more than 7Khz tx coil frequency (seperated tx and rx coil)
kind regards from germany and keep us informed