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LM3909 flashing indicator circuit diagram

This LM3909 flashing indicator circuit is made using LM3909 integrated circuit and a seven-segment LED indicator.This LM3909 flashing indicator circuit can be used to display a number (eg number of houses) or to create an optical warning (eg safety belt).
The electronic circuit is very simple and can be powered with a battery "button cell type" (eg AG3 button cell) 1.5 volts.

Circuit Diagram: 
LM3909 flashing indicator circuit diagram

Comments

..can u show another circuit use 7 segment led

why use 470uf capacitor particular that value ,how to determine that value

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