The electronic circuit "Flashing LED" by YuGiOhJCJ[1].
Music "Cockpit view" by Poisoncut[2].
Thanks to PA5CAL on Futura Sciences forums[3].

I use some resistors, capacitors and transistors to make my light-emitting diodes flashing.
In fact, this electronic circuit without LED is called "Astable multivibrator".

I heard that there are others solutions to make light-emitting diodes flashing :
-using directly a flashing LED
-using the NE555 integrated circuit

[1] http://yugiohjcj.1s.fr/
[2] https://8bc.org/members/poisoncut/
[3] http://forums.futura-sciences.com/