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hboy007

Fri Oct 21 2011, 03:15PM

Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374

resonant pressurized spark gap: A spark gap is put inside an acrylic tube that is pressurized at 2-3 atmospheres. A powerful speaker is used to pump the fundamental or a lower harmonic resonant mode of the acrylic cavity. The gap distance is set so that the gap fires every second or third cycle of the pressure oscillation. The more pressure oscillations per pulse-to-pulse duration, the lower the jitter. An upper limit is imposed by aliasing (triggering one pressure period too early or too late).

This spark gap may be used for tesla coils, lasers etc.

Inducktion

Fri Oct 21 2011, 03:49PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Coilgun cutter;

Basically, take your standard coilgun, and make a rather small projectile and barrel.... two of them, and set them up so one will fire into the other.

Have some sort of sensor that will cause the other barrel to turn on when the projectile reaches a point, and then shoot it back up into the other.

Speeds, and other things should be changeable, and this *should* allow for cutting certain objects. Wood, possibly, I don't entirely know about metal...

Legit_bacon

Sat Oct 22 2011, 01:03AM

Registered Member #4034 Joined: Thu Jul 28 2011, 10:41PM
Location: somewhere in the Southern hemisphere
Posts: 138

how about you join the cutter idea with forty's idea and make a 'band saw' like coilgun cutter?

jnbrex

Sat Oct 22 2011, 03:06AM

Registered Member #3950 Joined: Wed Jun 15 2011, 12:45AM
Location:
Posts: 51

I can't even imagine how inefficient that would be. The projectile would have to be moving at EXTREMELY high velocities to cut the wood. This would require magnitudes more power than a conventional band saw, because the projectile would have to be slowed down and then accelerated again after every firing. Not to mention the very low saturation and significant eddy currents of a flat piece of steel... Interesting idea though.

Tetris

Sun Oct 23 2011, 12:57AM

Registered Member #4016 Joined: Thu Jul 21 2011, 01:52AM
Location: Gainesville, FL
Posts: 660

Actually marketing plasma speakers for actual speakers. They're loud enough!

M.A.D.

Sun Oct 23 2011, 07:11AM

Registered Member #4052 Joined: Thu Aug 11 2011, 04:43AM
Location: IN ,USA
Posts: 69

I had an idea:

Some lightbulbs for cars have two filaments, if you remove the metal base you could heat one filament and use the other as an anode so you have a very cheap, crappy rectifing diode tube.

I was going to try this but the lightbulb I was planning to use was destoyed in another project, and I am to lazy to go get a new one. Sad, I know.

Also, I have to say I like the whole coilgun bandsaw thing, just because it would be so unnecessarily violent in every way

hboy007

Sun Nov 06 2011, 02:10PM

Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374

Green displays!

display backlights can draw between 20W and 60W of power under normal operating conditions, about 2/3 of the power a monitor draws. The rest is used for heating the air behind the monitor and to continuously expel electronic fumes

Now imagine a finned reflector that tracks the sun over the usable interval of ~6h and throws the light onto a prism diffusor foil behind the panel. Once the sun is around the corner, the fins close and an LED backlight is activated.

Since I currently don't have much time left for such fun stuff, I'm showing this idea to you and a proof of concept pic with the panel I dismantled and rebuilt for a DIY beamer that was never finished (guess why).
The construction exhibits a typical illumination density of 600-1000 cd/mÂ² when the sun shines. The monitor that was used here is not fully suitable for reproduction because a 0.5mm pitch FFC cable extension had to be soldered ... but there are models that have a more humane connection for the LVDS driver board on the back of the display assembly.

I'd love to see this done with a 22" monitor and the reflective fins at the back.

ps. : a slightly tinted LEE foil will be needed to correct for the greenish tint introduced by the panel, for this one #169

looks suitable
pps. : I'm gonna clean my window right now!

Conundrum

Thu Nov 17 2011, 10:20AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Heh, nice.
I actually have four broken monitors here with fried backlight drivers.
Three still work but without a driver they aren't a lot of good.
Unless.. I put them across our window to harness ambient light!
Keep the existing backlight diffuser sheets (the shimmering ones with those weirdass patterns) but replace the rear light spreader with one from a large TV that doesen't have the little dots.
Et voila, envirowhiner friendly TV

Cut power from 80W down to <12W for a typical 32" TV
and everyone is happy.

Also...
Interesting idea:-

If magnetic nanoparticles can be moved around (i.e. ferrofluid)
Why can't I just make nanoparticles coated with sodium silicate.
Fire at high temperature and then fix haemoglobin molecules onto
them so that they replace the red blood cells.

The plan here is to replace the heart with a temporary system which
keeps tissue (ie brain etc) oxygenated even if the heart has stopped.
Use a rotating magnetic field to keep the "blood" flowing and run an
induction heater to keep the body warm, with direct current stimulation
to keep the lungs working.

Might be useful for cryostatic suspension (i.e. near freezing storage)
as the person could be warmed up evenly where needed until the heart
restarts on its own.

Could also be useful for severe (i.e. currently fatal) hypothermia as the
conventional rewarming itself often causes death because the cold blood
from the surface hits the deeper tissues and causes sudden cardiac death.

Removing them from the body would be very simple, requiring nothing more
than a trivially modified dialyser with magnet and could be completed
within an hour or less.
Plus the body should be able to deal with remaining contamination by normal
ellimination methods.

Maybe I am onto something here?

-A

Steve Conner

Thu Nov 17 2011, 11:05AM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

hboy007 wrote ...

Green displays!

Great idea! But up here it gets dark at 3pm in winter, how will we get on with our work?

I suppose it would be a way of avoiding RSI too.

conundrum wrote ...
Maybe I am onto something here?

Sounds more like you are on something

Conundrum

Tue Nov 29 2011, 10:53AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

Heh. Well it was worth a try.

OTOH, I had another good idea.
Hboy007's idea for variable lenses would work *great* for a custom module for combining R,G and B laser beams or even multiple red burner beams so they are parallel.

Perhaps by applying HV to the resin while setting it can be tuned "on the fly" by electrophoresis?

-A

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