Step 4: External component wiring
Objective: Solder all components and wires
This step completes all internal and external wiring of the circuit. The wiring diagram is
shown below. It is a good practice to label the external wires because you may need to
unconnected and re-connect some wires to locate problems. Wrong wiring may cause
damages to electronic components. Use the continuity test of DMM to check wiring.
