PCB Development from Schematic to Manufacturing

Before AI consulting and iOS apps, I spent meaningful years in hardware development. PCB development is one of those domains that looks magic from the outside and is mostly process discipline from the inside. Here's the engineering-team view.

The PCB workflow

1. Requirements — what does this board need to do? Power? Connectors? Form factor?
2. Schematic capture — symbolic representation of the circuit
3. PCB layout — physical placement and routing
4. Design rule check (DRC) — automated verification
5. Manufacturing files — Gerbers, drill files, pick-and-place data, BOM
6. Quote & manufacture — send to fab
7. Assembly — components soldered on (usually by the same fab)
8. Test & bring-up — does it actually work?

EDA tools

• KiCad — open source, free, dominant for hobbyist and increasingly professional work. Our default.
• Altium Designer — industry standard for serious commercial work. Expensive but powerful.
• Eagle — formerly popular, now Autodesk Fusion 360 Electronics
• EasyEDA — browser-based, integrated with JLCPCB. Good for fast prototypes.

Schematic capture: get this right or pay later

The schematic is where you'll catch most bugs — long before they become physical. Discipline that matters:

• Net names — meaningful, consistent, every net
• Power and ground symbols, never just labels
• Pin numbers verified against datasheets
• Decoupling capacitors on every IC — not optional
• ESD protection where signals enter the board

PCB layout

Layout is where electromagnetic reality meets your design. Key principles:

• Power planes — give every layer a continuous reference. Floating ground is the source of so many problems.
• Trace width sized to current — use a trace width calculator. Undersized traces burn up.
• Differential pairs — for USB, Ethernet, etc., must be length-matched and impedance-controlled.
• Decoupling caps close to ICs — within mm, not cm.
• Thermal pads — power components need copper pours to dissipate heat.

Design for manufacturing (DFM)

The board layout that looks beautiful on screen often manufactures badly. Things to optimize for:

• Standard layer counts — 2 or 4 layers cost 10x less than 8. Plan for 2 or 4 unless you need otherwise.
• Common components — JLCPCB has free standard parts. Pick from their list to save assembly costs.
• Standard hole sizes — non-standard drills slow manufacturing.
• Adequate clearances — too-tight clearances cause assembly errors. JLCPCB's standard is fine for most designs.
• Fiducials — pick-and-place machines need them.

Component sourcing

The 2021-2022 chip shortage taught everyone a lesson: parts can go end-of-life or out-of-stock overnight. Source from multiple distributors (Digi-Key, Mouser, Arrow, LCSC) and prefer "lifecycle: active" parts with high stock.

For consumer products: design around parts that have at least 5-year guaranteed lifecycle.

Picking a fab house

• JLCPCB / PCBWay — Chinese, cheap, fast (2-3 weeks for prototypes + assembly). Default for low-volume work.
• OSH Park / Macrofab — US-based. Higher cost, faster turnaround, ITAR-compliant.
• Specialty fabs — for flex, rigid-flex, high-frequency. Different vendors.

Always order extra units (~10-20% beyond what you need) to allow for DOA and test destruction.

The crossover between hardware engineering and AI consulting is real: many manufacturers we work with are now adding AI features to their products. djEnterprises consults on both layers when projects need it. Book a call.