17 What is tinning?“Tinning” means covering the tracks & pads on your PCB with solderPCB tracks & pads are made of copperWhen exposed to air & oils on your skin, copper oxidizesPCB must be tinned in order to prevent corrosion & ensure a good electrical connection
18 Steps for tinning your PCB 1.Clean all tracks2.Apply flux to all tracks3.Heat tracks & add solder4.Spread & add solder over all tracks
19 Safety Solder over workbench Treat pencil as always hot Safety glasses must be wornSolder Contains Lead – Washing hands is recommended
21 Review 1. The best ratio of solder to use in electronics is: 2. This is because:3. We use _______-based flux4. What is the difference between a soldering gun & pencil?5. Why do we tin our PCB’s6. What safety considerations are important to remember when soldering?