OpenTMS Publishes Open-Source TMS Coil and Power Supply Designs
Zach McGinty's OpenTMS project puts coil and power supply designs on GitHub, using hollow copper pipe for cooling and microwave oven transformers.
Zach McGinty published an open-source transcranial magnetic stimulation project called OpenTMS on October 7, 2026, according to Hackaday. The project makes coil and power supply designs available on GitHub.
The OpenTMS coils use hollow copper pipe to carry coolant. The power supply uses two microwave oven transformers switched by IGBTs in a flyback configuration, with fiber optics isolating the IGBT gate controls.
McGinty states that OpenTMS is not a medical device and is not approved by the FDA or local authorities.
Transcranial magnetic stimulation is well studied and approved by regulatory agencies as evidence-based medicine for treatment-resistant depression, a distinction that separates clinical TMS systems from this open-source hardware project.
Quick answers
What is OpenTMS?
OpenTMS is an open-source transcranial magnetic stimulation project published by Zach McGinty. Its coil and power supply designs are available on GitHub.
Is OpenTMS a medical device?
No. McGinty states that OpenTMS is not a medical device and is not approved by the FDA or local authorities.
What does the OpenTMS power supply use?
It uses two microwave oven transformers switched by IGBTs in a flyback configuration, with fiber optics isolating the IGBT gate controls.