The sensor works. The board is still too large, noisy, or power-hungry to wear.
Shrinking the outline can damage signal quality, battery behavior, assembly, and comfort. Solder coordinates sensing, power, wireless connectivity, sourcing, and mechanical layout so the next prototype can move closer to the body and the product.
- Applications
- Wearable and sensing prototypes
- Design focus
- Signal paths, power, and form factor
- Validation
- Electrical and product testing scoped separately
The challenge: shrink the wearable without shrinking the signal margin
Inara already had a working prototype. The difficult part was making it 26% smaller while keeping the biosignal path, battery and power behavior, USB-C charging, assembly, and mechanical fit aligned. A smaller outline alone would not have made the product more wearable if it introduced noise or fragile assembly choices.
- Share the signal chain and relevant sensor documentation.
- Provide raw measurements and test conditions when available.
- Identify analog, digital, and radio activity that may interact.
A working prototype still had to become smaller, more reliable, and ready for real-world testing.
The redesign had to reduce size without sacrificing signal quality, improve the power system, and simplify assembly. Solder used sourcing automation, power-domain review, and focused layout work; the published project story reports a 26% smaller board and Gerbers in one week.
Read the Inara project storyThe fix: combine sourcing, power review, and mechanical layout
Solder's project story documents three connected moves: find available component replacements, flag power-domain overlaps and voltage margins before layout, and tighten routing with the mechanical design in the loop. That sequence produced the reported smaller board and one-week Gerber handoff.
- Provide enclosure geometry and contact locations.
- Distinguish wearable dimensions from development-board dimensions.
- Preserve test access during early revisions.
Budget power across the whole product
Battery life depends on the sensor, processor, radio, firmware duty cycle, regulators, and charging architecture. A PCB revision can address hardware contributors, but a runtime target cannot be established from the board alone. Define operating modes and ownership of firmware power management before choosing components.
- Document active, idle, and charging behavior.
- Review power switches and wake-up requirements.
- Account for the battery and charging connector in the enclosure.
Keep product claims and validation separate from board delivery
A wearable prototype and a validated medical product have different requirements. If the device has a medical intended use, identify the applicable engineering, testing, documentation, and regulatory work with qualified specialists. The PCB scope should say what is designed, what is reviewed, and what evidence must still be generated.
- Define the intended use without expanding it through marketing language.
- Assign responsibility for product-level safety and validation.
- Keep revision history and design assumptions available for review.
Related engineering in practice
Explore published projects with related design constraints. Each project has its own scope and validation requirements.
Documented impact
26% smaller, with Gerbers in one week.
The Inara project story reports a 26% smaller board after sourcing replacements, reviewing power domains and voltage margins, and coordinating electrical layout with the mechanical design. Gerbers were delivered in one week.
Read the Inara project storyA few useful details
Questions,
answered.
Can you work on EEG, EMG, or other sensing boards?
We can assess a project involving sensor acquisition and analog front ends. Feasibility and scope depend on the signal chain, performance targets, existing design, and available measurements; share those details before assuming a particular capability or outcome.
Can you shrink a wearable board and extend its battery life?
Both can be design goals, but they require separate analysis. Board size depends on components, interfaces, assembly, and mechanics; runtime also depends on firmware and operating behavior. The scope should identify the tradeoffs and how improvements will be measured.
Does a redesigned PCB make the product medically certified?
No. PCB design or review does not establish medical certification, clinical performance, or regulatory approval. Those requirements need a separate product-specific validation and regulatory plan.
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