Introduction: Micro 555 Timer Circuit

About: Worked in electronics for 15 years. The soldering iron is mightier than the pen! ✍

At 10mm x 10mm, this is one of the smallest 555 I.C circuits you'll ever see!

Step 1: The Idea

So far this has just been a project of mine to shrink down a 555 timer circuit as small as I can using micro electronics.

The circuit is pretty self explanatory.

Experiment with different resistors to get different speeds if you're using it with LEDs.

I used a 0.4mm sized soldering tip to solder all the components too as this was really difficult & I needed a tiny needle point tip to solder most joints.

Step 2: Parts List

Surface mount 555 timer IC - LM555CMM (MSOP-8 size)

100nf 0603 capacitor

All resistors are 0603 size, 1% tolerance

Transistor - SMT 3904, size SOT-323