A coin cell sized coin cell powered ring oscillator with LEDs
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This is a just-for-fun-project. I wanted to make a small circuit which uses only a few discrete components to make a chasing light like effect.
The PCB is a circle with a radius of 13.5mm. The circuit consists of 7 inverter stages which are connected in a circle. Hence the name "Ring Oscillator".
Each invertar consists of a N-Channel MOSFET, two resistors, one LED and one capacitor.
Since the PCBs are meant to be wearables, I wanted to come up with a nicer shapes. So I designed a Heart shaped one.
The idea is basically the same as for the pizza. It's a ring oscillator consisting of an uneven number (in this case 13) of inverters. This one is also powered by a CR2032.
Two main differences are that for the sake of space on the PCB I use resistor array packages as current limiting resistors for the LEDS and dual packaged MOSFETs. Also there are two holes in to top to add small wire loops.
marble
Chris 
ElectronicABC
jaromir.sukuba
nagup
I made something similar. I am using a BC847 and a slightly modified circuit. You can look at the image and a video here https://www.instagram.com/p/Bzr0lXBn9m9/