Single-Sided PCB Reverse Engineering: Cost & Lead Time

Single-sided PCB reverse engineering is the cheapest and fastest class of board recovery there is. One copper layer means no layer separation, no X-ray, no imaging of buried planes — an engineer can recover the full netlist from good photos of both faces plus continuity checks on the bare copper. Cost is driven mostly by component count, board size, the deliverable set you need, and whether magnetics or firmware are in scope. Most single-layer jobs run in days, not weeks.

Why one copper layer is the cheapest board to work from

On a single-sided board, every trace is visible. There is nothing hidden between laminate plies, so the destructive part of the process — grinding, delaminating, or scanning layer by layer — simply doesn’t happen. That removes the largest cost and risk item in multilayer work, and it also means your sample usually comes back intact.

Most single-sided boards you’ll encounter are paper-phenolic (FR-1, FR-2) or CEM-1, with 1 oz copper on the solder side only and unplated holes. Through-hole parts sit on the component side, so the copper geometry, the pad shapes, and the annular rings are all right there under a camera. Trace widths and spacings are generous by modern standards, which makes automated edge detection reliable rather than a coin flip.

There’s a second reason these jobs move quickly: the circuits are usually understandable. Single-layer construction shows up in LED drivers, offline power supplies, appliance control boards, motor controls, ballast boards, thermostats, and older instrument panels. A senior engineer looking at a 40-component flyback supply knows what it is supposed to be within a few minutes, which makes verification much faster than tracing an anonymous digital board. If you want the wider context, our comparison of single-layer and multilayer board duplication puts the effort difference side by side.

What the engineer is actually looking at

• Copper geometry — trace centerlines, widths, pad diameters, unplated hole sizes, board outline, mounting and tooling holes, V-cut or breakaway edges.
• Wire jumpers and zero-ohm links — single-sided designs route the “second layer” with insulated wire links and 0 Ω resistors. These are nets, and missing one is the most common error on this board type.
• Creepage and clearance — on any mains-connected board, primary-to-secondary spacing and the routed slot are part of the design, not an accident. We measure them and carry them forward rather than letting a CAD tool close them up. IPC-2221 spacing guidance is the reference we check against.
• Copper weight and current paths — heavy traces on a motor or power board exist for a reason. IPC-2152 gives the current-carrying context when we have to reconstruct a wide trace that has been partially burned or scraped.
• Component markings — body codes, date codes, manufacturer logos, and the silkscreen reference designators on the component side, where they exist at all.

What actually drives the price of single-sided PCB reverse engineering

Nobody can quote this board type sensibly from the words “single-sided.” Two boards of identical size can differ by a factor of several in effort. These are the variables that move the number:

1. Component count. The dominant driver. Copper tracing scales with board area; schematic capture and BOM work scale with parts. A 25-part LED driver and a 220-part appliance controller are different jobs on the same laminate.
2. Board size. A 300 mm ballast board takes longer to image and stitch cleanly than a 40 mm module, even with fewer parts.
3. Deliverable set. Gerber and drill files only is the lowest tier. Add a netlist, a full schematic, a BOM with sourceable part numbers, and editable CAD, and each step adds real hours.
4. Silkscreen and marking condition. Many low-cost single-sided boards were built with minimal legend, and field boards arrive discolored by heat. Illegible markings push work into measurement and cross-referencing.
5. Magnetics. This is the hidden cost item on single-layer power boards. Transformers and common-mode chokes have to be identified by core, gapping, wire gauge, turns ratio, and winding order — and that often means sacrificing one part and unwinding it.
6. Conformal coating or potting. Coating adds a cleaning step. Potted sections add a removal step with real risk to the parts underneath.
7. Firmware. If a programmed 8-bit MCU is on the board and you need the code as well as the copper, that is a separate scope with its own feasibility question. It is often the single largest line item on an otherwise cheap board.

Because those variables swing so widely, we quote per board rather than by a rate card. The write-up on how reverse engineering cost is calculated walks through the same drivers with multilayer examples for contrast.

Deliverable tiers and what each one buys you

Plenty of customers who arrive asking for “the files” actually want the schematic, because their real goal is to change something — swap an obsolete regulator, raise a current limit, or add a connector. If that’s you, say so up front. Recovering copper and recovering intent are different jobs, and the second one costs more but is what you’ll end up using.

How long a single-sided board takes, and what stretches it

The honest answer is a few working days for a typical board, measured from the moment the sample lands on the bench — not from the day you emailed. A small LED driver or thermostat board with legible markings and no magnetics is at the short end. A large appliance controller with 200 parts, a heat-discolored legend, three custom-wound inductors, and a request for editable CAD sits at the long end and can run past a week.

Things that reliably add days:

• Custom magnetics. Unwinding and documenting a transformer is careful manual work, and if you only sent one board we have to ask before we destroy the part.
• Unmarked or house-numbered parts. Sanded-off ICs and custom part numbers mean electrical characterization instead of a datasheet lookup.
• Damage. Burned copper, cracked phenolic, or a section that has been repaired with flying wires means we’re reconstructing intent, not just copying geometry.
• Firmware in scope. Read protection on the MCU determines the schedule far more than the board does. AVR and 8051 parts use lock bits and security fuses; MSP430 designs use a JTAG fuse or a BSL password; STM32 parts use RDP levels. Each of those has a different feasibility profile, and we tell you which one you’re facing before you commit.
• Assembly or test as part of the order. Building a verification unit adds procurement time for the parts, which is often longer than the engineering itself.

One thing that does not stretch a single-layer job: layer count questions. There is no stackup to guess at, no impedance target to reconstruct, no blind vias to map. That is why this board class is the one where we’re most comfortable committing to a short schedule at quote time.

What to send us, and what comes back

You can get a real answer without shipping anything. Send this:

• Photos of both faces — the whole board in frame, square to the camera, on a dark non-reflective background. Diffuse light, no flash. The solder side matters most; that’s where the copper lives.
• Board dimensions — length, width, and thickness, plus a ruler or caliper in one shot for scale.
• The main chip marking — a close, sharp photo of any IC or MCU top marking. This is what tells us whether firmware is even a question.
• Close-ups of anything odd — wire jumpers, a burned area, a transformer with no part number, a potted block.
• One line on deliverables — “Gerber only”, “Gerber plus BOM”, “I need a schematic I can edit”, or “I also need the firmware.”
• Quantity — one repair unit, fifty spares, or ongoing production. It changes what we recommend.

What comes back from us is short and specific: a feasibility read (including any part we think will be a problem), the deliverable set we’d recommend, a lead time in working days, and a price. If a free look at the sample would settle the question faster, we’ll say that too — that’s what the free sample evaluation is for.

Where single-sided work gets harder, and where we say no

This board class is easy in general, not easy in every case. A few situations genuinely complicate it.

Field boards that have already been repaired

Single-sided phenolic lifts pads when it gets hot. A board that’s been through two field repairs may have jumper wires that were never part of the original design. We flag these rather than faithfully copying somebody’s rework, but distinguishing factory wire links from field repairs takes judgment and sometimes a second sample.

Boards where the schematic matters more than the copper

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