-No need for special modificated power supply.
-Very cheap to make ( < 10 € ) !
-Stable operation.
-Up to 3 A current.
Two ICs " LM 555 " timers can be used or a single " dual timer " IC ,the LM556.
Pin Layouts:
Timing :
Frequency : 1.44 / ( R1_FREQ +2(R2_FREQ+POT_FREQ)) x C_FREQ
Pulse width : 1.1 x ( 1 + POT_DUTY ) X C_DUTY
RESISTANCE IN OHMS ,CAPACITANCE IN FARADS.
For more info : http://electronicsclub.info/555timer.htm
http://www.bowdenshobbycircuits.info/555.htm
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