Saturday, July 16, 2011

Transcranial Magnetic Stimulation project - part 1

Transcranial Magnetic Stimulation (TMS) is a technique to stimulate brain tissue directly through the skull. It works by sending a very high current pulse through a coil that is located on the subject's scalp. The fast-rising edge of the pulse induces a current in the brain tissue, causing neuron stimulation.

This device uses a capacitor bank, high current SCR, trigger circuit, figure-8 (or butterfly) coil, and high voltage charging circuit.

Link to the SCR datasheet:

Some good technical information:



  1. Ha! I found a complete TMS system at the local university surplus auction. I didn't buy it, however.

  2. great work. Where did you get the SCR and how much did you pay for it.

  3. The SCR was donated by a generous person. I don't know what it is worth.

  4. Hi Ben, could you please send me the specifications of TMS? I tried to enter the page:, but it was not found. I'm from Brazil.

  5. The same as Alexandre- your link isn't working,

    where can I source a 400v capacitor?? all the ones I see floating around are 2.5 volts