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[[File:3LEDseries.jpg|left|thumb| 3 LED in series]] | [[File:3LEDseries.jpg|left|thumb| 3 LED in series]] | ||
[[File:3LEDparallel.jpg|left|thumb| 3 LED in parallel]] | [[File:3LEDparallel.jpg|left|thumb| 3 LED in parallel]] | ||
'''''555 Timer in Astable Mode''''' | |||