Old Tech Keychain Charms: How to Make Them

Yes, you can turn old tech into keychain charms—circuit boards, phone SIM cards, and even broken headphone jacks make durable, lightweight charms. The process involves careful disassembly, cutting or shaping, and adding a keyring attachment, and it requires only basic tools. This guide covers what parts work best, how to prepare them, and how to avoid common pitfalls.

Why Old Tech Makes Great Charms

Old tech is abundant, cheap (often free), and visually interesting. A circuit board has intricate traces, gold pads, and tiny components that look like abstract art. A SIM card has a metallic chip and a unique serial number. Even a broken smartphone screen can be cut into a small glass tile that catches light. Unlike plastic trinkets, these charms carry a story—they were once part of a device you used.

Another advantage is durability. Circuit boards are made to withstand heat and vibration, so they hold up well on a keychain. Metal parts from old laptops or phones are even tougher. The main concern is not durability but size and weight—you don’t want a charm that’s too heavy or bulky.

What Parts to Salvage

Not every piece of old tech is suitable. Here’s what typically works:

• Circuit boards – from phones, routers, or remote controls. Look for boards with visible traces or a distinct shape.
• SIM cards – the full-size card (before you pop out the mini SIM) is perfect. The chip is thin and flat.
• Headphone jacks – the metal barrel can be cut and polished into a cylindrical charm.
• Hard drive platters – shiny, mirror-like discs that can be cut with a rotary tool.
• Keyboard keys – mechanical keycaps are colorful and have a satisfying profile.
• Camera lenses – small glass lenses from old phones or webcams make unique pendants.

Avoid batteries (they can leak or catch fire), cathode ray tubes (they hold a vacuum and can implode), and any component with sharp edges that could cut you or your pocket.

Tools and Safety

You’ll need basic tools, most of which you may already have:

• Safety glasses – always wear them when cutting or grinding.
• Dust mask – cutting fiberglass boards creates fine dust that irritates lungs.
• Rotary tool (e.g., Dremel) with cutting discs – for shaping boards and metal.
• Small hand file or sandpaper – to smooth edges.
• Drill with a 1–2 mm bit – to make a hole for the keyring.
• Needle-nose pliers – to open and close jump rings.
• Epoxy or super glue – for attaching a bail or loop if you can’t drill.

Work in a well-ventilated area, especially when cutting fiberglass. Wash your hands after handling old electronics—they may contain lead or other heavy metals in solder, though the risk is low for casual handling.

Step-by-Step Process

1. Disassemble – Open the device and remove the board or part you want. Use a screwdriver, not force. Cut any attached wires or connectors with flush cutters.
2. Clean – Wipe the part with isopropyl alcohol to remove dust and oils. This also makes the surface easier to see.
3. Mark the shape – Use a pencil or a fine marker to draw the outline of your charm. Keep it simple—circles, squares, or rounded rectangles are easiest.
4. Cut – Use a rotary tool with a cutting disc. Go slowly and let the tool do the work. For thin boards, you can also score with a utility knife and snap along the line.
5. Sand edges – File or sand the edges until smooth. This is important for safety and looks.
6. Drill a hole – Mark a spot near the edge (at least 2 mm from the edge to avoid cracking). Use a small drill bit, and place the part on a scrap wood block to avoid drilling into your table.
7. Attach the keyring – Open a jump ring with pliers, slide it through the hole, then close it. You can also use a split ring directly if the hole is large enough.
8. Finish (optional) – Apply a clear coat of epoxy or nail polish to protect the surface and give it a glossy look.

Common Problems and Fixes

Board cracks while drilling. This happens when the bit is too large or you push too hard. Use a smaller bit (1 mm) and let the drill do the work. You can also clamp the board to a piece of wood.

Edges are rough. Use a fine-grit sandpaper (400–600) to smooth them. For fiberglass, wet sanding reduces dust.

Charm is too heavy. Choose a smaller piece or remove excess material. You can also hollow out the back with a rotary tool, but that’s advanced.

Keyring hole is too small. Use a jump ring that fits the hole, then attach the jump ring to a split ring. Or drill a slightly larger hole (2 mm) if the material allows.

Components fall off. If a capacitor or chip is loose, you can re-solder it or glue it with epoxy. For a cleaner look, you might want to remove loose parts entirely.

Design Ideas and Variations

Beyond a simple square, you can:

• Keep the original shape – Some boards are already shaped like a shield or a rectangle; just add a hole.
• Use a SIM card – The full-size card is thin and has a chip. You can write a word or symbol on the back with a permanent marker.
• Combine parts – Glue a small gear from an old printer onto a board piece for a steampunk look.
• Add a photo – Print a tiny photo on sticker paper, stick it to the board, and seal with epoxy.
• Make a set – Create matching charms for your keys, bag, or zipper pulls.

Alternatives to DIY

If you don’t want to cut and drill, you can still make a charm without power tools:

• Use a whole SIM card – Punch a hole in the corner with a paper punch (the type for plastic cards).
• Wrap a component – Take a small capacitor or resistor and wrap wire around it to form a loop.
• Use a keycap – Most keycaps have a plus-shaped hole on the bottom; insert a small ring or wire through it.
• Buy a ready-made kit – Some craft stores sell blank circuit board pieces that are pre-cut and pre-drilled.

Frequently Asked Questions

Is it safe to carry a circuit board charm? Yes, as long as you sand the edges smooth and don’t carry loose components that could break off. Avoid boards with sharp pins or exposed battery contacts.

Will the charm scratch my phone or other items? Possibly. The edges can be rough even after sanding. You can coat the charm with clear nail polish or epoxy to create a smooth, protective layer.

Can I use a charm from a broken smartphone? Yes, but be careful: smartphone boards are often multi-layered and may have sharp edges. Also, remove any attached battery before cutting.

How do I make a hole without a drill? You can use a heated nail or paper clip to melt a hole through plastic, but this doesn’t work on fiberglass. Alternatively, use a strong adhesive to attach a small eye pin or jump ring.

What if the board has a battery attached? Remove it first. Batteries can be dangerous if punctured. Dispose of them properly according to local regulations.

Can I sell charms made from old tech? Yes, but be aware that some components may contain hazardous materials. Check local regulations on selling electronics waste. Also, avoid using brand logos or trademarks that might be protected.

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