Originally published at: https://contextualelectronics.com/topic/finishing-the-schematic/ Here are some of the links used in these videos: http://www.555-timer-circuits.com/flashing-led.html https://en.wikipedia.org/wiki/555_timer_IC http://www.nxp.com/docs/en/data-sheet/ICM7555.pdf
In the video, pin 5 (ctrl voltage) of the 555 timer is connected to ground. But in the reference schematic it's left unconnected. Does this matter?
It does! You found the secret error that is rectified in the last video. It's ok if you end up connecting it, you'll need to bodge it like I do.