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PCB manufacture quality control because I suck ):
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circuit wizard
Test circuit works in simulation
exposure
keep protective film on long as possible
Check box for smudges
Don't smudge the artwork
developer
Accurate mixture
Hard to overdevelop so do it for longer than you think
etching
Temperature
Timing
Rinse
Scrub
make sure to scrub edges
sanding
don’t go over lines
Drilling
make sure the drill bits are sharp
Make sure the light on the machine is on for accuracy