A LED light-up greeting card is a fun, easy way for kids to start exploring circuits, while lighting up someone's day.
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Light Up LED Card : 7 Steps (with Pictures) - Instructables
DIY Light Up Cards : 6 Steps - Instructables
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Light-Up Card : 9 Steps (with Pictures) - Instructables
Light-Up Card : 9 Steps (with Pictures) - Instructables
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Sari on Science: Make your own LED light-up greeting card
Light-Up Card : 9 Steps (with Pictures) - Instructables