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- 04:46, 8 January 2009 diff hist +134 Basic Circuit Building Blocks →Seven segment LEDs
- 04:43, 8 January 2009 diff hist +127 Basic Circuit Building Blocks →Pull Up and Switch
- 04:40, 8 January 2009 diff hist +126 Basic Circuit Building Blocks →Light Emitting Diode ( with current limiting resistor )