There comes a time in every project when it needs a name. This moment came when I had a pile of blueprints all with the title field empty. So VBIT is the name of this gadget. VBI is for vertical blanking interval and T is for teletext.
Isn't EDA software fun? Lucky I got all the components first and laid them out on a printout of the top layer. Why did the programmers postfix footprints with E for narrow and N for extended? So I had to swap these around. Also the SOIC pads were too small for hand soldering so I had to stretch them all by 1mm. Then the auto routing is brain dead so I had to lay out all the tracks manually. FreeRoute is very good but then I can't import the results back because the pads and tracks don't exactly line up so it fails the design rules check.
Then plotting to Gerbers is like warping back in time 30 years, when everything had to fit on a double density floppy. Why do I need to know all about drill decks and aperture lists? Madness!
So the design is now at the PCB maker but I already spotted an error. No pull-ups on the I2C. Oops. This is what it would look like if the pull-ups were fitted.
Engineering Change Note 1: pull up SCL and SDA to +3.3v using 3k3 resistors.
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