What are wires connected with solders

Summary soldering of breadboard boards

Solder SMD components

SMD components are not easy to solder,

  • because they don't fit on the 2.54mm grid on the breadboard
  • because they cannot be fixed by connections in holes in soldering points.
  • There are adapters for SMD components on the 2.54mm grid.

SOT-23 package

However, SMD components in the SOT-23 housing with three or four connections can be soldered onto a normal breadboard. They are placed between four solder points.

Fig. 1: SOT-23-4 or SOT-143 on breadboard

A SOT 23-4 package can simply be placed on the edges of four solder points.

Fig. 2: SOT-23-3 on breadboard

A SOT 23-3 package is placed on the edges of two solder points. The third connection is between two soldering points. As shown in Figure 2, it is connected to these two via a wire.

Figure 3 shows how an SMD component with three connections can be soldered in. The three-pole SMD component was installed on the top. The top connection was connected to a wire on the top. The lower connectors are connected to the underside of the board.

Two-pole SMD components

Two-pole SMD components can be easily placed on a breadboard between two soldering points.

Solder in SMD components

We only consider the soldering of SMD components on breadboard boards.

Unlike components with connections, SMD components are not easy to fix through holes in the board. They are usually so small that clips or the like cannot be used.

We fix SMD components by soldering a connection.

If the soldering islands on which the SMD component is to be placed contain solder, remove all excess solder.
  • Little solder is applied to the soldering island so that a very flat elevation is created.
  • Right-handers are best to tin a connection at the bottom right.
  • Left-handers are best to tin a connection at the bottom left.
Grasp the SMD component with one hand with tweezers.
Hold the soldering iron with the other hand.
Position the SMD component correctly and attach it to a connection.
Solder the remaining connections of the SMD component.
  • Wait between soldering.
A connection between two soldering islands is connected last with a wire.
If necessary, re-solder the connection that was attached first.
Remove excess solder, preferably with a desoldering cord.
Check with the magnifying glass whether
  • all connections are connected and
  • no short circuits have occurred.
  • a SOT-23-3 package with connected ports
  • a soldered SMD component
  • a prepared soldering point