Replaced optocoupler with comparator protected with zeners

1 job for improvement-komparatorunfuck in 3 minutes and 30 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
failed build #603

00:03:30

 
Name Stage Failure
failed
build Test
$ latexmk -pdf
Latexmk: This is Latexmk, John Collins, 1 January 2015, version: 4.41.

Latexmk: No file name specified, and I couldn't find any
Use
latexmk -help
to get usage information
Cleaning up file based variables
ERROR: Job failed: exit code 1