Hardware products don't usually fail for just one reason. They fail because the founder was focused on one type of risk and didn't see the others coming.

Maybe they nailed the engineering but never proved anyone would buy it, or they validated demand but the design couldn't pass certification.

Or they got both right and ran out of cash funding production out of their own pocket.

I've made more than one of these mistakes myself.

The risk breaks down into three types: technical, market, and financial. Over the next three emails, I'm going to walk you through all three and how to reduce each one.

We'll start with the technical side, because this is where the mistakes get really expensive.

I thought my prototype was finished and ready for manufacturing. But when I brought it to the manufacturer, they told me it could never be mass-produced.

That was rough to hear at that late stage. The redesign cost me months and a lot of money.

So here's what I missed: an engineer with manufacturing experience would've spotted those issues reviewing my design files. I just didn't have one looking over my work.

The irony is, I'd spent over a decade as a microchip design engineer at Texas Instruments, where no design ever went to manufacturing without a room full of engineers reviewing it first. But when I went off to build my own product, I didn't have that system around me.

A design review is that system. Before you commit to fabrication, tooling, or certification, you get experienced eyes on your schematic, PCB layout, and mechanical design.

The problems they catch aren't the ones you'd find on your own. They're things like a component that works fine in your prototype but can't be sourced at production volumes.

Or a PCB layout that'll fail EMI testing because traces are routed too close to the antenna. Or an enclosure design that looks great but adds $3 per unit in unnecessary assembly time.

These are mistakes that cost thousands to fix after fabrication. They cost significantly less to fix before you send files to the manufacturer.

And some of the most expensive mistakes happen even earlier than the design review stage. Your choice of wireless protocol, power architecture, MCU, and form factor get locked in early and become very expensive to change later.

Pick the wrong wireless protocol and you might discover six months in that it doesn't have the range you need, or that the certification path is twice as complex as you expected. Choose a power architecture that can't support a critical feature and you're looking at a board-level redesign.

So getting a review before those early choices are locked in is worth more than catching layout issues later.

Even if you're not at the design stage yet, this is worth understanding now. These are the kinds of mistakes that get baked in early and become expensive to undo.

The earlier you know what to watch for, the less likely you are to carry one of them forward without realizing it.

In my next email I'll cover the second risk, and it's the one that catches the most founders off guard: proving people will actually buy your product before you spend serious money building it.

Cheers,

John Teel

Founder / Engineer
Predictable Designs

P.S. If you want experienced engineers catching these kinds of mistakes on your design, that's exactly what the Hardware Academy is built for.