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Step 4: 4: Sand PBC for soldering and drill holes for

Picture of 4: Sand PBC for soldering and drill holes for
I used 220 grit sandpaper and a mini screwdriver to sand the board where illustrated. I couldn't find a drill bit small enought so I used a regular drill with a snapped in half sewing needle for a drill bit. Use the raw edge of the broken needle for the drill tip.
 
chemguy5 years ago
This step is very unclear about what you are soldering and desoldering. Please show us more clearly where the jumper wires go and WHAT you are sanding because I dont see any need for it at all.