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EFD50 Transformer 8+8 Pins Double Slots Bobbin8+8 pins EFD50 coil former, double grooves EFD50 transformer. Bobbin size=49.2mmX47.2mmX23.3mm. Parallel distance=42.0mm, Pin Pin distance=6.0mm. EFD50 Transformer multi section frame. EFD50 through hole bobbin, electronic transformer mainly used for switching power supplies, welcome customized transformers and inductors.