Finishing The Schematic


#1

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


#2

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?


#3

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.