EMR pressure detection

Pressure detection

In a video I published in 2022 (How do EMR pens work), a specific method to detect pressure is shown. This method involves moving the ferrite core which then alters the resonant frequency of the LC circuit. This design is from a very, very old EMR pen design.

Modern designs use a separate pressure sensor which is more reliable for detecting pressure.

The OLD EMR pen design can be seen in this teardown of the Huion PEN80 pen.