Instructables

Naff Movie into 'DVD Spectra'

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Everyone has at least one DVD they are ashamed of buying. You know, the DVD that was 'a good idea at the time', was watched half way through and then consigned to the back of the DVD rack, 'hidden' from prying eyes. This instructable makes some use of that mistaken purchase.

This idea came out of my need for a workable spectrometer to gather some data. Rather than looking to buy a commercial one, it was more useful (and cheaper) to build it out of the bits I had lying around. It turns out its fairly easy to use a CD for this purpose - but most of the older related pointers seemed to require you to build a box yourself, and in any case I wanted to use a DVD to improve the resolution.

Thus the idea of taking the DVD, case and all, to construct the spectrometer was born.
 
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Step 1: Parts list

- One extremely naff DVD, in a black, full size case
- Stiff card
- Stickytape
- Two knife blade refills, or the lid from an old tub of margarine
- 'DVD Spectra' Templates
- Old translucent plastic bag

Tools
- Sharp knife
- Steel rule
- Multipart rotary tool, such as a dremel

As far as the DVD is concerned the best option is a single layer DVD to ensure you get a sharp spectra. These can be found often as the old 'flippy' DVDs, the freebie DVDs given away with newspapers/magazine, or writeable DVD.

The sturdier the card, the sturdier the 'DVD Spectra' - however the harder it is to cut. By all means you can use the cornflake box, but I'd suggest something a little thicker.
Diffraction gratings &/ made from CDs are more reliable.
westfw4 years ago
Made one, got it working fine, even though my DVD case wasn't quite the right size for the templates. Used pieces of a floppy disk shutter to make the slit. The Instructable could use a photo or diagram showing proper eye position and viewing angle. It's a bit counter-intuitive to be looking mostly "down", instead of along the line of view toward the light source (the hole being large enough to permit quite a range of eye positions...)
myrddyn5 years ago
A good source for a diffuser is the window from the next bill you get in the mail. You typically don't have to worry about wrinkles, and it's a nice even diffusing material.
jeandeau6 years ago
Excellent Instructable! I placed my blades about 0.1mm apart. When I looked at the suns spectra, I immediately noticed a multitude of black lines and thought this was a fault in my spectroscope. Thank you for the mention of the Fraunhofer lines. I speculated the lines I saw might be absorption lines but thought that was far too much to expect from such a simple device. When looking at a fluorescent bulb, The two bright sodium lines are distinctly resolved. Your concise and educational instructions led me to relevant web resources and I must say.. WOW!!
triggernum56 years ago
And I thought the instuctable on converting a stuffed beaver into a PC case was cool.. This is though is way cooler.. Have you considered rigging a webcam etc into it?
WattSekunde6 years ago
Great!, Really great! Thanks' for the idea.
bedbugg26 years ago
your dvds look like video cases in that photo
bedbugg26 years ago
omg i can now have a good reason to own snakes on a plane yay!
Finally, a good use for "Titanic"... lol But seriously, could you also use dvdr's or does it have to be an actual pressed dvd?
Great instructable! Thanks!
Yessss for Eternal Sunshine of the Spotless Mind!!!11 I think I've watched that at least 6 or 7 times =]
Donnie Darko is pretty awesome, too. I should watch that again.
Phesarnion7 years ago
Great idea... i might have to build me one of those simply for the geek value of saying "I have a spectrometer... do you?"
saying that - "You can then close the case upproudly display it amongst all the other DVDs - the ones you aren't ashamed of." *cough* Pirates of the Carribean *cough*
hehe
DoWatt (author)  Phesarnion7 years ago
I have a wide and varied collection of naff movies... Anyway, POTC can't have be that bad given the business done on POTC2 and that will be done on POTC3.
Teenage Girls + Johnny Depp and Orlando Bloom = $$$$$$
Period.
POTC2 = booty (heheh) in every sense of the word . . .
yarrr...
Dorkfish927 years ago
Thumbs up! This is so cool! I went all around my house looking at all my different lights. lol. Great instructable!
royalestel7 years ago
Neato! Thanks for posting. I've seen other DIY spectrometers, but yours is actually spiffy looking. Half a cheer for this! Hip-hip Hoo!
DoWatt (author)  royalestel7 years ago
Than....
DoWatt (author)  royalestel7 years ago
Yep, as I said in the acknowledgement there are others around. I did it this way to make an integrated solution, DVD and DVD case, both used for the majority of the unit.

PS Than... = Thanks (from the half cheer...)
OH! Right. I thought . . . heheh :)
TheLobb7 years ago
Some dvd cases have the discs held in, differently can this be an issue? or is it all good
DoWatt (author)  TheLobb7 years ago
I focused on the typical Amaray black DVD case, much copied by virtually every other supplier. Obviously the transparent cases won't be much use, and if the disk is not held in the same position or the case is one of those cardboard ones, that won't work either. However I'll guess that 50% of disks are in these standard cases. The important factors are: position of the disk, a deep rim to hold the wedge parts in place, black or at least opaque case to shut out the light, and standard thickness to fit the template.
ongissim7 years ago
Could this work on the thinner DVD cases, also?
DoWatt (author)  ongissim7 years ago
Probably... The reason I chose the normal thick case was because the edges are deep enough to hold the wedge parts firmly in place. Therefore the DVD insert template is setup for this size of case. A thinner case would need a thinner template, and probably a different fixing mechanism.