DPScope SE - the simplest real oscilloscope/logic analyzer on the planet

Step 16: Resistors

To solder, touch the component lead (wire) with the soldering iron and the solder wire at the same time. Add enough solder so it completely fills the hole and leaves a small “hill” of solder. Remove the solder wire and the soldering iron but don’t move the board before the solder has become completely solid again. The solder joint should be shiny and bright (if you are using lead solder; the new, RoHS compliant solder will look dull). Repeat for the other leads. This is how the bottom of the board will look like when you are done:

Now clip off the protruding wire ends with the wire cutter. Take your time – this is a good opportunity to check that you did not accidentally forget to solder some of the connections!