I am trying to create an induction loop detector by following this http://www.allaboutcircuits.com/projects/metal-detector-with-arduino/ but apparently something is wrong on my side or I missed something.
I have soldered a PCB with a BC338, resistors and capacitors and I bought ENAMELLED COPPER WIRE to create the loop.
Connected all together but when I try to get any metal close by, nothing happens, there is not actually "clock" sent to the Arduino. Only if I power at 12V and I short quickly the coil wire to the pin I get a pulse for a second.
At 3.3 and 5v I get nothing, the voltage across the two pins of the coil is 0.035V and nothing increase when a put a metal close by.