This simple flashing light circuit is powered with 6 volts/0.5A and has a low current consumption when the light bulb is off. The flashing frequency is set by only one capacitor. Transistor T1 may be ...

Due to the advantages like low voltages, long life, cheap, reliable, fast on-off switching etc, the LED's are used in many applications.

The electronic version is also simple to make, and is a great introduction to the concept of circuits – the cornerstone of many maker projects and core knowledge for the budding robot-builder.