The Gapstorms PCBs are now available on PCBway (project is still in the review process and maybe it takes some days to unlock)  Have fun building and cutting.

https://www.pcbway.com/project/shareproject/G_EDM_Gapstorm_Pulseboard_14dd4341.html

Key Improvements compared to the EVOIII Board:

•   Compact Size:

    PCB footprint reduced to only 99mm x 99mm.

•   Simplified Manufacturing:

    Some through-hole (THT) components replaced with surface-mount (SMD) versions for easier assembly.

  Integrated Current Shunt:

•   The current shunt resistor is now onboard, reducing wiring complexity.

•   Upgraded Op-Amps:

    Replaced LM358 with OPA350 for improved performance.

•   Advanced Gap Proximity Sensing:

    Features two sensing channels: one for current feedback and one for voltage.

    Unlike EVOIII, which connected voltage sensing to the power bus and detected only hard shorts via voltage drops, Gapstorm’s voltage sensing provides fast, linear, real gap proximity detection.

    Requires firmware update to utilize this feature.

    The PCB includes a footprint for converting between gap proximity sensing and bus voltage sensing by unsoldering and repositioning a resistor.

Wiring and Calibration Enhancements:

•   The onboard shunt resistor simplifies wiring, eliminating the need for an external shunt wire.
•   Uses a fixed voltage divider for voltage feedback, removing the need for calibration potentiometers and making setup plug-and-play.

Power Mosfet Improvements:

•   Replaces four parallel IRFP260N Mosfets with a single, screw-mounted SOT-227 package.
•   The new Mosfet's package is electrically isolated from the drain, allowing direct mounting onto the metal enclosure, which acts as a large heatsink.
•   No soldering needed; just screw the Mosfet onto the enclosure with a touch of cooling paste recommended.
•   This design simplifies assembly and enhances thermal management.

Adjustable frequency range up to 100khz is supported by the firmware. In theory the firmware has no problem providing 200khz but it makes no sense and pollutes the CPU too much as there is an interrupt on the rising edge to trigger the readout of the ADC samples. It does skip if there is already a readout triggered but it still is extra load and from what I have seen there is just no need at all for higher frequencies.

The "new thing" as of 11.April.2026 is the Gapstorm pulseboard together with the EVOIII Motionboard.