- 1). Turn the soldering iron on and set it at a temperature of 400 degrees Fahrenheit.
- 2). Place the LED horizontally on a flat and dry surface such that its leads are facing you.
- 3). Identify the LED lead with which you want to solder the resistor. Depending on the circuit design, it can be the positive or the negative lead. The longer LED lead represents its positive terminal.
- 4). Melt a small amount of solder flux on the LED lead to be soldered to the resistor by holding the solder wire on the LED lead and then touching the interface of the wire and the lead with the soldering iron tip. As soon as you notice the solder flux has melted and covered the lead's end portion, retract the solder wire and put the soldering iron tip back in its holder.
- 5). Place the resistor on a flat, dry surface with any one of its leads facing you. Hold the solder wire at the end of the resistor's lead and touch the interface of the lead and the solder wire with the soldering iron tip. The solder will melt and cover the end of the resistor's lead. Retract the solder wire and put the soldering iron tip back in its holder.
- 6). Pick up the resistor with tweezers and hold its soldered end to the soldered end of the LED lead and touch their interface with the soldering iron tip. The solder in both leads will melt within two to three seconds. While keeping the resistor in place, retract the soldering iron tip and put it back in its holder. The solder flux will solidify within three seconds at which point you can let the resistor go.
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