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5+5 Pins EE13 Flyback Transformer BobbinStep transformer bobbin. 5+5pin EE13 horizontal EE13 bobbin. Mn-Zn ferrite core bobbin. Parallel Distance=8.5mm. Pin pitch=2.5mm. Coil former Size=12.3mmX12.3mmX11.1mm. We produce and design various EE13 electronic transformers, mainly used for power supplies, lighting, UPS, computer equipment, telecom communication systems, welding machines and other industries.