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Transcranial Magnetic Stimulator

Sub muscle-twitch-threshold TMS unit built from cheap materials, 10 PPS, 12 PPS, 15 PPS, for treating depression or/and addiction.

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My aim was to mimic a protocol used in a National Institutes of Health study, conducted on cokeheads in Italy. I don't attempt to match peak energy levels delivered there. Instead I optimize what can be done from a standard 120 volt outlet, using a microwave oven transformer, two motor run capacitors, and two cheap SCR brick modules. Drive circuitry is kept simple. Replication of this design might be possible under primitive conditions. This project may have been a fool's errand. Or if it's God's way, it should prove sufficient.

What is addiction? In 2013 scientists cured cocaine-addicted lab rats by injecting waking-state brainwaves into the rat's prefrontal lobes. Rats quit self dosing. Scientists could also inject sleep-state brainwaves, and the rats would begin self-dosing again. Addiction apparently functions like a hypnotic trance. It's funny to imagine a rat losing self control. When rat's prefrontal lobes were awake, their self control worked fine. Their common sense didn't want more coke. This also gives us insight into the addict's curse. Their self control is asleep. They really can't stop partying.

Study authors suggested Transcranial Magnetic Stimulation (TMS) might revive human prefrontal brain activity. TMS uses a high power pulse generator to drive an applicator coil. Magnetic field from the applicator coil fires nearby neurons. Being a high-power pulse generator engineer who makes prototypes, I began work immediately. My objective was to develop a simple TMS package for other makers to improve upon. Here we have a TMS system buildable from cheap parts.

Meanwhile clinical TMS trials showed promise in treating humans with cocaine use disorder (CocUD).

I delivered this unit to opiate users, who live far away from me. We don't communicate regularly. Alas they kept partying. Opiate addiction is probably harder to beat than CocUD. But on a positive note, one of them suffered from crippling depression. This unit gave him relief from that.

TMS Test Data, Explanation of Terms.pdf

Explanation of Terms used in Test Data Sheet

Adobe Portable Document Format - 28.60 kB - 01/20/2024 at 10:42

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TMS 7 Test Data Sheet.pdf

Test Data Sheet

Adobe Portable Document Format - 59.32 kB - 01/20/2024 at 10:28

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PULSE DRIVER BD 1037-SH.pdf

Pulse Driver Board Schematic

Adobe Portable Document Format - 189.69 kB - 01/20/2024 at 10:21

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Adobe Portable Document Format - 118.45 kB - 01/20/2024 at 10:21

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POWER CONTROL TIMER BD 1034-SH.pdf

Power Control Timer Board Schematic

Adobe Portable Document Format - 114.75 kB - 01/20/2024 at 10:21

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  • 1
    Make Power Control Timer Board

    Assemble board as shown. (See schematic and parts list.)

  • 2
    Assemble Pulse Driver Board.

    The latest revision uses larger SCRs. Ideally, both SCRs should lay flat on the board, to be affixed by 4-40 screws.

    Assemble board as shown. (See schematic and parts list.)

  • 3
    Prepare Vacuum Cleaner Bulkhead, Fabricate Baseplate

    I cleared out thru-holes in this plastic bulkhead, for the baseplate to mount onto. I removed the filter basket, and sanded the snout off the blower inlet. Initially my threaded studs hung up in the holes, making assembly and disassembly difficult. So I spun the studs in a drill, and sanded the center portions smooth. I also reamed out the through holes slightly with a tapered reamer. Another thru-hole was drilled, to bring wires down from the control plate. This hole was sized to pass a four-pin square Molex connector.

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