JASPER Blog
Technical insights on membrane switch design, material selection, manufacturing processes, and sourcing best practices — from engineers with 15+ years of industry experience.
Engineering notes by task
Find articles by design decision
Use these topic paths when you need help with tooling review, materials, backlighting, waterproofing, circuit tails, quality control, or supplier selection.
-
QFN Thermal Pad Assembly Design
Review QFN thermal pad assembly design with device-specific copper, via, and stencil guidance, plus hidden-joint evidence and coordinated release checks.
-
Matrix Keypad Ghosting vs. Common-Bus Wiring — When to Add Blocking Diodes in Industrial Membrane Switches
Learn how 3-key phantom presses (ghosting) occur in row-column membrane switch matrices and when to specify Common-Bus wiring or embedded…
-
PCB Solder Mask Design: Openings and Slivers
Review PCB assembly solder mask design: openings, registration, fine slivers, shared openings, inspection evidence, and fabrication and assembly approval.
-
How to Prevent ZIF Connector Pinout Reversals in Custom Membrane Switches — Top vs. Bottom Contact & Stiffener Stack-Up Guide
Avoid mirror-image pinout reversals on custom membrane switches. Learn how to specify Top vs. Bottom contact ZIF tails, 0.30 mm…
-
Via-in-Pad PCB Assembly Review
Review via treatments, pad planarity, solder-loss risks, fabrication notes, and inspection evidence before releasing a via-in-pad PCB assembly design.
-
PCB Fiducials: Global and Local Alignment
Review PCB assembly fiducials with board and panel diagrams, local alignment checks, mask-clearance guidance and process-specific design reference examples.
-
Subsurface Screen Printing vs. Digital UV Printing on Graphic Overlays — Preventing Outdoor UV Fading, Abrasion, and Dead-Front Ghosting
Compare subsurface screen printing and digital UV printing for custom graphic overlays. Learn how to prevent outdoor UV ink fading,…
-
PCB Panelization for Assembly
Review PCB panelization for assembly with rail, fiducial, support and separation checks. Approve panel drawings around real line and fixture…
-
Capacitive Sliders and Wheels in Custom Control Panels
Compare capacitive sliders, wheels and buttons for custom control panels. Define mapping, endpoints, wraparound, feedback and prototype acceptance tests.
-
Polyester (PET) vs. Polycarbonate (PC) Graphic Overlays — Preventing Emboss Cracking and Chemical Delamination
Compare biaxially oriented Polyester (Autotex PET) and Polycarbonate (Lexan PC) for membrane switches. Prevent stress-cracking around embossed keys and chemical…
-
Dead-Front Capacitive Touch Panels: Hidden-Until-Lit Icons
Specify a dead front capacitive touch panel with clear off/on acceptance criteria, aligned touch targets, and fixed-exposure sample reviews for…
-
PCB Assembly Component Clearance
Review PCB assembly component clearance for placement, inspection, rework, connector mating, fixtures, and final integration with package and tooling evidence.
Need Help With Your Project?
Our engineering team can review your design files and provide a detailed quote within 24 hours.