Laser Gatling Gun.

This is a project waiting on my whim to dive into.

The idea is for entertainment and consists of three ( RGB ) laser modules mounted on a rotating disk. As the disk spins via a small motor, each laser beam is permitted to shine through a small window in the external housing.  This will result in alternating beans of Red, Green and Blue exiting the same window.  It's "rate of fire" can be controlled by varying the RPM of the motor spinning the device.

The shaft would be common ground and a simple piece of brass tube, insulated by heat shrink, would fit over the shaft. Two brass brushes would transmit power to all diodes at the same time to simplify wiring.

The image below shoule be self explanitory.  I offered three sugested methods for rotating the disk.


If someone likes this and builds it please send me a photo of your creation and I will post it here.  Thanks


To view image full size just LEFT CLICK and "View Image"


Ronnie Raygun.

Named in honor of president Reagan's "Star Wars" initiative.

I am not providing specific instructions simply because if you obtain an old hand held timing light it would likely be totally different from this particular model.  Any pistol grip type light will work.  Not rocket science.

I just opened the case, stripped out the original components including the cables that formerly exited the handle and inserted a basic  2xAA battery holder.  Keeping the original trigger switch in series with a standard laser module, I put it all back in.

The original flash tube was held with a black rubber ring which proved to be a suitable mount for the laser so I used that as well.

Screwed it all back together and VOILA!  I have a ray gun!  Total build time, probably about fifteen minutes.  Enjoy.

Free Laser Mirrors

Front ( first ) surface mirrors are necessary when working with precision lasers. There is no absorption or refraction of the light when bounced off the face of the mirror.

While it is possible to buy these there are several often free sources you can tap into.

One is to go to your local pharmacy that processes film the old way. Many times people bring in disposable cameras which are tossed in the trash after the film is removed for developing. Those with certain types of view finders sometimes have small front surface mirrors. I obtained two from a wide angle disposable.

Another option is dead or obsolete hard disk drives.  Take them apart and carefully extract the disks.  See how shiny smooth they are !

Cover both side with masking tape to protect them.  Sandwich them between two pieces of thin plywood either with c-clamps or perhaps make a jig with a bolt through the center hole if you are going to do a number of these.

Use a hole saw in a drill press.  Choose size according to need.  Drill through the plywood only, before you sandwich any disks because you don't want a hole in your finished mirror.  The holes in the plywood will server to guide the hole saw with the center bit removed.

You can polish off the edges carefully and when you peal away the masking tape you will have a collection of pretty two-side front surface mirrors ready for use.



Try This:  Take a pair of battery powered, stereo add-on speakers of the cheap version ( kind with two separate speaker housings )  that you plug into your MP3 player.  Remove the grill faces and glue one of your new mirrors to center of each speaker cone.  Arrange the two speakers at 90o angles and aim your laser so it bounces from one to the other then onto the wall.  Crank up your bad-ass tunes!

You can also use a pair of stereo computer speakers for this...they are cheap but unless you want to keep a computer handy, get a pair that plug into ac outlet for power, or USB and a wall wart!


Want a cheap laser light show?

There is no doubt that a fancy computer driven set of laser scanners produces stunning performances with graphics coreographed to music.  I can't affod that but I still wanted to play with some form of laser entertainment using stuff I already have laying around.

Here is what I did. ( download PDF )


Dummy Test Load for Laser Driver

You don't want to see smoke drifting from your shiny new laser diode do you?

Use a test load to set the current on your driver board before attaching that precious laser to power.


For details this site has good instructions on this. CLICK