Wiring pencil

Awiring pencil(often sold under the trade names ofRoadrunnerorVerowire) is a tool for making electrical connections.

Two wiring pencils

Electronics board made with a wiring pencil

A small reel of insulated copper wireis mounted at the top of the tool. The wire runs down the center of the wiring pencil and through a hardened tip, which is small enough to move between the pins of 0.1 "pitchDIL chipallowing connections to be wrapped and the wire to be led across thecircuit boardto the next point it's needed.

The wire is coated with a polymer lacquer (commonly referred to as enamel, but notglass based). Once wrapped the connections aresoldered,the heat of this burning the lacquer away and completing the joint. Insulated wire is normally 38 SWG (0.15mm), ground connections are sometimes made with uninsulated wire which is slightly heavier (33 SWG, 0.25mm).

A well ventilated area and/or fume extraction are very important when carrying out this process due to the toxic fumes. Sometimes, where there are many wires, plastic comb-like structures are used for wire management.

See also

• Wire wrap
• Solderable enamel wire

External links

• http:// instructables /id/Mechanical-Prototyping-Pencil/