Fab Speakers

Soldering a component

Often you start by soldering the flattest, finest-pitch components first (in this circuit, that would be the amplifier chips). If you’ve never soldered surface-mounted components before, though, it might be better to start with a coarser component like the 0.47 uF capacitors. Note that the capacitors aren’t marked, so the easiest way to identify them is by keeping them in their original packaging, which should be labeled with their value (capacitance). Otherwise, the 0.47uF, 2.2uF, and 1uF capacitors can all look alike.

The bare circuit board.

The bare circuit board.


Hold the iron against the pad for a second or two, apply solder, and wait a second or two before removing iron.

Hold the iron against the pad for a second or two, apply solder, and wait a second or two before removing iron.


It should look something like this.

It should look something like this.


Carefully position the 0.47 uF capacitor with tweezers (either way around), hold the iron against its side for a few second until solder melts, remove iron, and release capacitor.

Carefully position the 0.47 uF capacitor with tweezers (either way around), hold the iron against its side for a few second until solder melts, remove iron, and release capacitor.


The solder should hold the capacitor in place.

The solder should hold the capacitor in place.


Solder the other side of the capacitor: hold the iron against it for a second or two, apply solder, and wait a second or two before removing iron.

Solder the other side of the capacitor: hold the iron against it for a second or two, apply solder, and wait a second or two before removing iron.


The capacitor soldered in place.

The capacitor soldered in place.


Solder the other 0.47uF capacitor the same way. It should look something like this.

Solder the other 0.47uF capacitor the same way. It should look something like this.

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