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Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
umm, Flat, two layers aprox 40 turns i have a physical relay, but no, no addional suff i try to make it a simple a s possible, using built in circuitry of the camra, i had dozens of the board i had one that had a push turn on a charge LED made it easy to know when its done. a 1-2min charge time, but gets longer after each shot, the batteries are 2 AAA for compactiblity so it only last about 5-6 pulses
Registered Member #2909
Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145
ok here is a short video i made, ther is a big magnet, the veiwing film and disk lanching sorry for the lack of sound i was tired and did'nt feel like narrating. here is a few pics of the guts of it the large switch is to use the terminals on the side.
here is the coil, it did look better when i had a clear CD over it but that brook off so duct tape will do
Registered Member #3620
Joined: Sat Jan 15 2011, 04:16PM
Location:
Posts: 11
OK I just bought 20 Flash Capacitors. 100uF/ 330 V. Next, I will try to come up with a circuit to fire them or some of them with a microcontroller and some SCR's. Any suggestions?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi guys,
Well I couldn't stop my curiosity and made an iron cored coil into which I pulsed a cap bank with an 30N60 IGBT. I tried nuking my occipital lobe with it (My brain is already fried so I have little to lose) but all I observed was a blown IGBT and absolutely no effect on me at all.
I used a rewired DRSSTC interrupter to provide 1ms pulses at rate of less than 1Hz. I had a coil of about 40 turns around 1x1cm steel laminations, like 7cm long and bypassed with a diode.
At 150V input I had current peak at over 200 amps and it reached the peak value after about 200-300us. And if I remember correctly the real TMS devices talk about mroe like 100a/us - despite I don't know the specs of their coil, I assume that the peak value of magnetic field (2T or so, saturation of the iron) has to be reached in few us, not 300. It's also likely that the iron cored coil doesn't propagate the field away from it as well as an air cored coil.
The coil could throw an aluminum ring and flip coins, but in short, no - a few photoflash caps won't do it, even with a cored coil.
I'd either have to use very high voltages in kV range, or extreme currents that would be difficult to switch with igbt's or scr's. If I retry this I'll probably use a kilovolt range supply and a spark gap for a switch - this would need major safety improvements before I dare to bring it near my head and I wouldn't want to do it alone.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
/me adds this to my MAFF backup file.
This has promise for treating severe migraines which both me and others I know suffer badly from.
Have you considered using a hybrid multiwound coil, i.e. 32 parallel wires wound into a flat coil like the ones used in induction cookers? this would allow smaller parts to be used, and even tailor the pulse to tune its shape (which can't be easily done with any other method!)
Re. magnetic sheets. I bought some of this stuff at great expense, laminated it and it even does 3-D to some extent. I put two sheets back to back and you can see some dimensional structure due to the angle of the particles. Has to be seen to be believed.
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EM pulse coil = small-scale model of a Transcranial Magnetic Stimulator (TMS)
