Circuit Labs - Electronic Circuits Collection

The humble PCB pin is used not only to connect wires to PCB tracks, but also for test and measurements points on circuit boards. Despite their mechanical simplicity, PCB pins are surprisingly difficult to mount and solder. Frequently encountered problems (admit it!) are burnt fingers while soldering the pin, and pins dropping from the board when the board is turned, or, worse, when they’re being soldered. Try to keep it in place with your finger — too hot to touch — look for pliers — pin dislocated — and so on.

It’s a good idea to drill the holes for the PCB pins a fraction smaller than the pin diameter — that way, the pin remains in place when you’re ready to solder it. However, that also requires a bit more force to push the pin into position and a tool is then useful to prevent injuring your fingers. Pliers may be less suitable, especially if considerable force is required on the pin. To the best of our knowledge, no commercial tool exists for the purpose. No problem, let’s make a PCB pin insertion tool ourselves.

A discarded round file or screwdriver is great. Cut or grind the shaft as straight as you can and drill a hole in the end so the ridge on the PCB pin is secure against the surface of the tool. The PCB pin is inserted into the tool and held in place with a nail or fingertip. The tool handle provides a secure grip and allows considerable insertion force to be applied. If an old file is used, it is recommended to cover the remaining section of the steel surface with heat shrink tubing. This will prevent injury to your hand.

Author:  Luc Lemmens (Elektor labs)

(Elektor Electronics Magazine – 2006)

* Download this article.