closeup of toroidal core coils and blue electrolytic capacitors on a green pcb

transformer inductor capacitor coil circuit row closeup electronic component pcb board wire copper toroidal core galvanic isolation blur background green electromagnetic induction magnetic ferromagnetic field holder electrolytic store energy aluminum electrical power spare equipment printed design audio video signal inside engineering electrotechnics industry technology technical laboratory repair service line ewaste recycling black blue bokeh toroid ring voltage choke ferrite condenser storage conductor capacitance electric device interface throughhole data industrial electrotechnology disposal gray