Should I place the sensor right between the shell and one of the moving gears to avoid being buried within the PCB?

It is an aftermarket trigger controller for an airsoft gun that works linear Hall sensors. Notice the Hall sensor at the very left. It's buried within the PCB! And it even looks like it has some exposed vias to aid with soldering. We plan to place the sensor right between the shell and one of the moving gears. Is this common practice?

Common enough. The process is called “Z-axis milling“. Used for LEDs sometimes too.

You can even bury low-profile parts such as bypass capacitors and resistors in cavities entirely within multilayer PCBs.

It requires extra steps so expect extra costs or MOQ or both. For small quantities the costs may be prohibitive, even from China.

Read More: LED PCB Assembly

#PCB Design

Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.
Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

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