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ETD39 High Frequency Power Transformer BobbinETD39 ferrite core bobbin, 8+8 pins horizontal ETD39 transformer frame. Parallel Distance=30.2mm. Bobbin Size=44.6mmX44.0mmX32.8mm. ETD39 ferrite core transformer has high magnetic flux and low loss magnetic materials, mainly used in PCB circuits, computers, monitors, printer, scanner, duplicator, mobile adapters, other equipment and instruments.