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A Business Card Case, make an opening that able to fit four 7 segment LED.
Drill one hole on left side.
Drill another hole on the right side.
A toggle switch is to turn on the power. Solder the switch with a battery holder (A27) recommend
Fix the toggle switch on the left. a push switch on the right.
Circuit board and discrete components refer to schematic diagram for more detail.
Schematic Diagram, alternately you may use other PIC micro-controller.
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