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ETD34 Power Supply Transformer BobbinETD34 SMPS transformer bobbin. 7+7 pins horizontal ETD34 coil former. Pin pitch=5.08mm. Parallel Distance=25.40mm. Bobbin size=40.0mmX38.5mmX30.5m. Phenolic PM9630 material ETD34 bobbin, new designed ETD34 injection tooling, we manufacture ETD34 electronic transformers.