Posted by rod on April 1, 2004, at 4:50:03
In reply to Re: Linkadge - Can you send those details, posted by Denise528 on April 1, 2004, at 3:17:58
No offense to linkadges construction and sorry to be such a "downer", but I have to say a few words on this topic.
Its indeed possible that linkadges device works, because no one really knows what the right parameters are, but I think his (?) device doesnt meet the specifications of a professional one.
denise528, I will send you a paper from a manufacturer of rTMS devices, where most things are explained. But there is not a detailed instruction how to build one, but maybe you know enough of it, or have a friend who is familiar with electronics. It shouldnt be a major problem to build it with some electronic knowloedge. I dont have instructions, because I gave up building my own, because it easely costs more then 2.000$. About the same price of a full treatment with a professional one and under the guide of a doctor. Most of the components are just damn expensive.
Linkadge uses an amplifier. I doubt his amp can provide up to 5.000.000 (5 Mega Watt!!!) of power per discarge. Of course this is not really a big deal, because its just for a very short time. In the paper you can see that they charge an array of capacitors and discarge them via Thyristors (some kind of electronic switch). They just short fuse the capacitor with the coil to achieve a peak of around 8000 Ampere and a rate of change of the magnetif fiel intensity (or magetic flow dansity) of around 30 kT/s (kilo Tesla per second) and get a peak of around 2,5 Tesla. That seems to be necesary to induce the proper electrical current in the brain. This paper also provides specifications about the coil. For rTMS a doulbe coil (called butterfly) with inside diameter 56 mm, outside diameter 87 mm, number of turns per coil: 9. etc. etc... You need that few turns to achieve the high rise in the magnetic field...
Again, no offense linkadge, yours might work aswell.Roland
poster:rod
thread:327303
URL: http://www.dr-bob.org/babble/20040329/msgs/331176.html