Electronics · Skill card · Lives at the wire station · build 2026.09.23-1644

Making Wires

The idea

A wire is the one component you manufacture yourself. Made well, it disappears into the circuit. Made badly, it becomes the bug.

Why make your own?

The precut bin gets you started, but real builds want wires cut to size. A board wired with right-length wires lies flat and reads like its schematic; a board wired with too-long jumpers is spaghetti, and every bug gets a loop to hide under. Besides — a wire you made and tested is a wire you know.

At the station: spools of 22 AWG solid-core wire, and wire strippers (the cutting blade is part of the same tool). Tools go back in the box — the next engineer needs them.

Know your wire

Our wire is 22 AWG solid core: one solid strand of copper inside a plastic insulation jacket. AWG is the American Wire Gauge — the number goes up as wire gets thinner — and 22 is the thickness a breadboard's spring clips are built to grip.

Solid vs. stranded

Some wire (your meter leads, for instance) is stranded — dozens of hair-thin strands. It bends forever without breaking, but it frays and won't push into a breadboard hole. Solid wire holds its shape and plugs in cleanly — that's why it's the breadboard wire. Its one weakness: bend it back and forth at the same spot enough times and it snaps.

Measure with the board

No ruler needed: breadboard hole centers sit exactly 0.1 in apart, so the board is the ruler. To size a wire, count the holes it must span, then add about 0.3 in per end for stripping.

bare end = 3 gaps 0.1 in 3 gaps = 0.3 in
Count the gaps between holes, not the holes. Four holes span three gaps = 0.3 in — exactly one strip length.

Cut

  1. Unspool a little more than you need and measure against the board: the holes to span, plus 0.3 in per end.
  2. Cut square across with the stripper's cutting blade (the flat blade near the pivot — not a stripping notch).

Cut ends fly

A snipped wire end launches off the blade fast enough to reach an eye. Point the wire down at the table or cup your free hand over the cut — and never cut with the end aimed at a face, yours or a neighbor's.

Strip

  1. Find the stripper notch labeled 22 — each notch is sized for exactly one gauge.
  2. Lay the wire in the notch with about 0.3 in sticking past the blade. That's three holes' worth on the board — measure until your eye learns it.
  3. Squeeze, then pull straight along the wire. The insulation slides off in one clean sleeve and the copper comes out bright and unscratched.
insulation solid copper core ≈ 0.3 in
The finished wire: ≈ 0.3 in of bare copper at each end, clean insulation between.

Why 0.3 in? Strip less and the copper can't reach deep enough for the spring clip to bite — the clip grips plastic and connects only sometimes, the worst kind of bug. Strip more and bare metal stands above the deck, ready to touch a neighbor and join two nodes you never meant to join.

Wrong notch, ruined wire

Too big a notch and the insulation just spins — nothing strips. Too small and the blade nicks the copper. A nicked solid wire snaps at the nick — sometimes later, sometimes inside the insulation, where it looks perfect and conducts nothing. That's where broken-inside wires come from; the beep test catches them.

The three checks

Every wire — fresh off the spool or out of the precut bin — passes three checks before it touches a board:

  1. Look. Copper bright and unnicked, insulation ends clean, strip about three holes long.
  2. Tug. Pinch each bare end and pull firmly. A nicked end snaps off in your fingers now instead of inside your circuit later.
  3. Beep. Meter on continuity, a probe tip pinched to each bare end. Beep = one unbroken conductor. (A lone wire has no power in it — always safe to test.)

The precut bin

The bin's wires are handmade, so give them the same three checks. If one fails, don't put it back — a bad wire returned to the bin is a bug planted in someone else's circuit. Re-cut and re-strip it into a shorter good wire, or scrap it.

When the probe won't fit

Multimeter probe tips are fatter than breadboard holes. Don't force one in — you'll stretch the spring clip underneath so it never grips a leg properly again. Instead, plug a short wire into the row and touch the probe tip to its bare end: everything in a row is one node, so probing the wire is probing the row. A spare component leg works too.

Make a couple of short probe wires and keep them in your kit — you'll reach for them every time the meter comes out.