DIY Electrolysis Machine Removes Hair Permanently

A maker built a DIY galvanic electrolysis machine for permanent hair removal using an RP2040 microcontroller, a 3.7V lithium battery with a boost converter to 15V, an OLED display, rotary encoder, foot pedal, and a DAC/op-amp/MOSFET circuit for precise current control. The project started with a crude 12V car battery setup and evolved into a polished device with a custom PCB and 3D-printed housing. Hardware files are available on GitLab. The build offers a low-cost alternative to expensive professional electrolysis treatments.