I just finished writing up some of the details on DIY plated through holes. This is what the simple constant current source was designed for. This process was slightly adapted from Think and Tinker – a really great site for DIY PCB fab. The overall process is:
1. Drill holes in the PCB
2. Coat the holes with a mixture of water-proof ink and finely powdered graphite
3. Cure the ink so it doesn’t rub off
4. Dunk the PCB in the electroplating tank, apply current, and let chemistry do the rest of the work.
Via the forum.