row of toroidal transformer inductors on pcb for audio or video signal galvanic isolation

electronic transformer inductor coil component circuit closeup row green galvanic isolation board copper wire toroidal ferrite core macro tech choke induction inductance voltage ring winding electromagnetic magnetic field black holder electrical engineering electricity device store energy printed pcb layer throughhole interface audio video signal inside electrotechnology electrotechnical industry technology repair science line ewaste disposal panoramic round plastic toroid ferromagnetic circle impedance stand electric equipment data layout electrotechnics technical spare design recycle separation inductors coils holders