batteries - Blinking LED with only 1 capacitor and 1 resistor - Electrical Engineering Stack Exchange
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Amazon.com: EDGELEC 100pcs 5mm White Blinking LED Diodes 1.5Hz Flash (Single Color Flashing) Clear Round Lens 29mm Lead DC 3V Blink Bulb Lamp Light Emitting Diode +100pcs Resistors (430ohm for DC 6-12V)
How to Make a Simple LED Flashing Circuit using 555 Timer IC
Create a blinking LED circuit with a z-diode and a capacitor - Electrical Engineering Stack Exchange