cylindrical inductor with black ferromagnetic core wrapped by red wire on pcb detail

abstract amplifier background band black blue blur bokeh carbon circuit closeup code coil color component conductor copper core cylindrical detail development device disassembled disposal educative electrical electricity electromagnet electromagnetic electronic electrotechnics electrotechnology engineering ewaste ferrite ferromagnetic field frequency green high inductance induction inductor industrial industry inside macro magnetic material miniature nobody pcb power radio recycle red repair research resistor science service signal small soldered solenoid technical technology twisted voltage winding wire wrapped yellow