ALTERNATING FLASHER ELECTRONIC DIAGRAM The first IC used as a 1 second clock, which generates ON/OFF for the other ICs. Diodes help to cover the IC555 from the peak voltage. Take note that the relay used should have impedance more than 50 ohm. Parts list : Diode D1-D2 : 1N4001 Zener Diode D2 : 6V R1,R5,R7 : 3k3 R2,R6,R8 : 68k Resistor variable VR1 : 47k Polar capacitor C1 : 10uF/16V Polar capacitor C3,C5 : 2.2 uF/16V Capacitor C2,C4,C6 : 0.01 uF Transistor T1 : BC107/BC148 IC timer : NE555 Relay : 6-9 V Power supply 6-9 V