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ER28 High Voltage Transformer Horizontal BobbinER28 transformer bobbin 6+6 pins, multi section ER28 bobbin. Horizontal ER28 coil former, Bobbin size=37.0mmX30.0mmX25.0mm, pin distance=5.0mm, parallel distance=30.0mm. We manufacture ER28 electronic transformers for power suplies, printers, computers, welcome customzied transformers.