This is a pic of the ring oscillator I built in Feb 2009. It’s the same as my earlier blog, but it has three LEDs per stage, so the supply voltage has to be higher.
I’m going to try to upload the few second video. This was taken from the back because the LEDs were too bright for the camera.CIMG1623 Will the upload work? I had to click on the link more than once to get it to download the video, but it worked.