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6+6 Pin EF30 High Frequency Transformer BobbinFlyback transformer EF30 bobbin. 6+6 pins horizontal EF30 coil former. Bobbin Size=28.8mmX28.5mmX18.7mm. Pin pitch=5.0mm. Parallel Distance=24.9mm. SMPS transformer has small size, high power and low cost, we design and manufacture high frequency transformer.