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Back9V 2xAA cell battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 2993 negative battery contact Keystone type 107 battery holder Keystone Battery Holder (http://www.memoryprotectiondevices.com/datasheets/BK-18650-PC2-datasheet.pdf Keystone Battery Holder.
- L_CommonMode_Toroid, Vertical series, Radial, pin pitch=3.00mm, , diameter=7.2mm.
- Spacing, 12.6x8.3x4.1mm Autotransformer, Toroid.
- Current-Compensated Ring Core Double.