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EI35 Power Transformer Vertical BobbinEI35 SMPS transformer bobbin. Phenolic material EI35 core coil former single slot. Parallel distance=20.0mm. Bobbin pin pitch=7.5mm. Bobbin size=32.2mmX25.8mmX28.2mm. We produce various HF transformer, CT transformers, bobbins and supply magnetic cores, we accept make new tooling to meet special size requirements.