Discrete 555 timer Blinky Xmas Tree

Blinky Xmas tree made with 9 LED's and a 555 in discrete form.

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Xmas tree that creates a 555 timer from transistors and resistors and configures it as an astable multi-vibrator to blink some LED's.

Should be powered through 2x CR2032 batteries or through the pins at the bottom. Works between 4V to 15V, but may need higher value dropper resistors for the LED's when powered by more than 6V.

A great way to learn soldering some pesky SMD components, mainly 0603 sized resistor, capacitors and LED's and SOT-23 sized transistors.

This circuit has not yet been tested, but should work as it's based on a working model.KiCad files are available, and you can buy the PCB here and help me:

x-zip-compressed - 121.29 kB - 12/05/2020 at 09:17


  • 13 × MMBT3904 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
  • 13 × MMBT3906 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
  • 9 × LED 0603 Fiber Optics / Emitters
  • 3 × Capacitor 0603 10uF
  • 2 × Resistor 0603 1Kohm

View all 15 components

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