Tiny LED Blinking Figure

You can easily blink the LED with arduino or 555 timer. But You can make a blinking circuit without such ICs. This is an simple blinking figure made from discrete parts.

• NPN transistor

2sc1815 x 2 or any little NPN transistor

• Capasitor

47μF x 2

• Resistor

4.7KΩ x 2 , 1KΩ x 1 , 100 Ω x 1 , 0 Ω x 1

• Battery

CR2032 x 1

• LED

Red , Green or Yellow x 1

• Copper plate
• Solder wire

This is a circuit diagram. It is called "astable multivibrator". If you are interested, google it with this word.

Putting the parts on paper will reduce mistakes.

Transistors, LED, and capacitors have a fixed direction. Especially for transistors, the pin arrangement differs depending on the type, so it is recommended to check the datasheet.

Refer to the figure for how to arrange the parts. I recommend to use breadboard as a jig.
Insert the E pin of the transistor into a breadboard, and solder the B pin to the negative side of the capacitor, the C pin to the positive side, the LED, and the resistor in this order. The 0Ω resistor is used as a stick that the figure holds in his hand. It may be just a copper wire.

Make sure you haven't forgotten the solder and that it hasn't shorted.
Let's turn on the power. Put CR2032 negative side to Copper plate , stand figure on the Copper plate and stick that the figure holds to top of the battery .

Figure that I made was blinked about 4Hz speed. If you want to change speed. Try change type of part.
For example

• 4.7KΩ Resistor to 10kΩ or 47kΩ , blink speed will slow
• 47μF Capasitor to 100μF, blink speed will slow