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Presensitized and Copper PCB Boards

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Single-sided and double-sided copper-clad boards and UV presensitized boards, in A4, A5, A6 or large formats, for making your own printed circuit boards.

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Choosing your printed circuit board

A printed circuit board is an insulating base (FR4 epoxy or FR1 bakelite) coated with a thin layer of copper. You draw the tracks, protect the copper you want to keep, then an etching bath dissolves the rest. Two families are covered on this page: the bare copper-clad board, which is exposed after transferring the artwork with an iron or toner, and the UV presensitized board, already coated with a photosensitive resin protected by an opaque film, which is exposed under a UV lamp and then developed.

  • Single or double sided: single-sided is enough for a power supply build or a small amplifier. Double-sided becomes useful as soon as the routing crosses over itself, but requires vias and careful alignment of the two artworks.
  • The format: A6, A5, A4 for a single board or a few copies, large formats such as 220x310 mm or large FR1 boards when you cut several boards from the same sheet.
  • The thickness: 1.6 mm is the standard, it holds connectors and terminal blocks well. The 35 µm copper layer suits everyday electronics; for higher currents, widen the tracks or tin them.

Also plan for drilling (0.8 to 1 mm bits for through-holes) and the etching bath. Other etching supplies and pad boards can be found in the Printed circuit boards category.

Frequently asked questions

What is the difference between a copper-clad board and a presensitized board?

A copper-clad board is simply bare copper on an insulating base: you have to transfer the pattern yourself, often using toner. The presensitized board already carries a photosensitive resin, which allows a finer, cleaner trace, but requires a UV lamp and a developer.

Single-sided or double-sided, which to choose?

Single-sided is easier to etch, drill and align, and suits most hobbyist builds. Go for double-sided when your routing cannot avoid track crossings or when you need a continuous ground plane.

What size board should I take?

Choose a format slightly larger than your board to keep margin for handling and cutting. For a single small build, A6 is enough; for several boards to etch at once, an A4 or a large format costs less per square centimeter.

What do FR1 and FR4 mean?

FR1 is a paper-phenolic base (bakelite), easy to cut with a knife or saw but more brittle. FR4 is fiberglass-reinforced epoxy, more rigid and more thermally stable, preferred for boards that need to last.

How do I store a presensitized board?

Keep it in its packaging, with the opaque film in place, away from daylight and heat. Remove the film just before exposure, otherwise the resin fogs and etching becomes uneven.