Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Need help with laser project

I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



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Default Need help with laser project

Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig






There was a similar project a few years back, laser MAME which was an
emulator of vector arcade games. The problem is that galvos have
physical mass and inertia, so the characteristics are quite different
than that of a vector monitor. If you can emulate the hardware on a PC
that's probably your best bet. There won't be a simple hardware converter.
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Default Need help with laser project


"Craig" wrote in message
...
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



I seem to recall that Elektor magazine did an x-y laser projector a couple
of years back, and that a kit was done for it. Might be worth you posting on
their website forum. Also, the actual mechanics and drive electronics to do
this are readily available at very reasonable prices form the likes of
Maplin here in the UK. They are used for disco lighting purposes, and
respond to the music, but as far as I know, the effect is achieved by having
an x-y mirror unit driven by stepper motors. I would have thought that it
would not have been terribly difficult to suitably scale and condition the
analogue x-y drives for a stroke writing monitor, to suit the mirror drive
circuitry of such a ready-made unit, and sub your laser into the optical
path in place of the lamp unit.

Arfa


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Default Need help with laser project

On Mar 21, 9:45 pm, "Arfa Daily" wrote:
"Craig" wrote in message

...



I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..


Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....


Thanks for any helpful suggestions!
Anyone for hire to help do this???


-Craig


I seem to recall that Elektor magazine did an x-y laser projector a couple
of years back, and that a kit was done for it. Might be worth you posting on
their website forum. Also, the actual mechanics and drive electronics to do
this are readily available at very reasonable prices form the likes of
Maplin here in the UK. They are used for disco lighting purposes, and
respond to the music, but as far as I know, the effect is achieved by having
an x-y mirror unit driven by stepper motors. I would have thought that it
would not have been terribly difficult to suitably scale and condition the
analogue x-y drives for a stroke writing monitor, to suit the mirror drive
circuitry of such a ready-made unit, and sub your laser into the optical
path in place of the lamp unit.

Arfa- Hide quoted text -

- Show quoted text -


It used a couple of DC motors to generate semi-random patterns using a
laser pointer

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Default Need help with laser project

On Wed, 21 Mar 2007 05:55:59 +0000, Craig wrote:

I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this? This is
for a single laser output (one color). The problem also is that I want to
increase the axis range dynamically so that I can project on a wall,
building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???


Some of this stuff might be interesting:
http://www.google.com/search?q=%22laser+light+show%22

And yes, I'm available. What's your budget? :-)

(just in case you're serious about hiring this out, the email in the
"from" line is bogus - to get a real email, take
(which is a spamdump) and elide ard.)

Cheers!
Rich



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Default Need help with laser project

Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



Open up a damaged cd or dvd player.
It has a nice lens arrangement which you can
use to move around/tilt a small piece of mirror
you glue on top of the lens.
Then feed the small coils with all sorts of
signals, and have fun with it.
As you are only changing the angles, just stay far
away from the target, and you will get a nice big
picture field.
(Oh and don't you or other people look into the laser beam)
For safety, you can make a small detection circuit,
to check for the presence of AC voltage on the
coils, and use that to switch on/off the laser.
That increases your safety manifold.
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Default Need help with laser project

Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



Oh I forgot one way to do this very easily,
glue pieces of mirror to two small loudspeakers,
then bounce the laser form the first mirror to the
next mirror, and use a stereo amp, and music to
move the mirrors/speakers.
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Default Need help with laser project

James Sweet wrote in news:cX4Mh.11668$e47.4988
@trnddc05:

The problem is that galvos have
physical mass and inertia, so the characteristics are quite different
than that of a vector monitor.


This was my initial thought: too much mass, too much inertia, slow
response.

But loudspeakers are really "linear galvanometers", and their frequency
response is quite good. Might be fun to figure out how to change a mirror
angle with an old speaker.

Old hard drives used a moving-coil in a magnetic field to scan the sensor
across the disk--another opportunity to turn an old part into an
interesting experiment.
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Default Need help with laser project


the vector crt signals are too fast by a factor of six or more for
even the best galvos, you'd have to recode the source to add delays,
considering, if this is a vector game, the vector generation timing
and scaling is always partially hardcoded in hardware,so you have a
BIG problem. Also crts don't have blanking points, buffer points,
extra corner points, all needed by even the fastest galvos, and most
vector systems, with the exception of a few that do sliding stroke
writing,(ie charge a integrator to the new point voltage) return to
center in between objects, the return to center is fine for a blanked
electron beam, but it confuses the heck out of the galvos. btw, as
you expand scan size, you need to slow down the scan rate.

galvos have inertia,electron beams for practical purposes dont.


the other way to do it is use a AO deflector pair, but thats
megabucks.


I know the fellows that did laser mame, and its not easy. plus if
your using game code, its a most excellent way to get sued. Laser
Mame passed the points from a emulated game to a pangolin card
that
drove the galvos, and that is probably the best solution. Galvos
limit out at about 700 points in a image.

if its military, like a flight simulator, start he

www.pangolin.com
then
www.camtech.com

if thats not fast enough

http://www.neostech.com/PDFs/ao%20deflectors.htm

neos makes a nice 512x512 XY deflector, so does

www.Intraaction.com

probably Crystal technology and Brimrose do as well.

none of the mentioned hard drive motors, modified speakers etc will
get you anywhere close to the speed of a true galvo with feedback
I used to earn my living doing vector graphics with lasers.


Steve Roberts



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Default Need help with laser project

On Wed, 21 Mar 2007 20:41:50 +0100, Sjouke Burry wrote:
Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from
a circuit designed to output to a vector scan monitor and redirect them
to laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this? This is
for a single laser output (one color). The problem also is that I want
to increase the axis range dynamically so that I can project on a wall,
building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

Oh I forgot one way to do this very easily, glue pieces of mirror to two
small loudspeakers, then bounce the laser form the first mirror to the
next mirror, and use a stereo amp, and music to move the mirrors/speakers.


I'd cut out the cone, and let the spider support the voice coil. Then, get
a little mirror, mount it seesaw fashion, and couple the voice coil to
one end of it. Your second mirror would have to be wider or taller than
the first one, depending on how much deflection you're looking at.

But people have been doing laser light shows for decades! Didn't I post a
link earlier today to a google of "laser light show"?

Good Luck!
Rich



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Default Need help with laser project

Sjouke Burry writes:

Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



Open up a damaged cd or dvd player.
It has a nice lens arrangement which you can
use to move around/tilt a small piece of mirror
you glue on top of the lens.
Then feed the small coils with all sorts of
signals, and have fun with it.
As you are only changing the angles, just stay far
away from the target, and you will get a nice big
picture field.
(Oh and don't you or other people look into the laser beam)
For safety, you can make a small detection circuit,
to check for the presence of AC voltage on the
coils, and use that to switch on/off the laser.
That increases your safety manifold.


By design, the lens does not tilt significantly. It moves up and down
(focus coil) or side-to-side (tracking coil).

--- sam | Sci.Electronics.Repair FAQ:
http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
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Default Need help with laser project

Sjouke Burry writes:

Craig wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..


Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig


Oh I forgot one way to do this very easily,
glue pieces of mirror to two small loudspeakers,
then bounce the laser form the first mirror to the
next mirror, and use a stereo amp, and music to
move the mirrors/speakers.


Lougspeakers don't change angle but only translate (at least
ideally). Any angle change is a byproduct of non-linearities
in the system.

There are relatively inexpensive galvos that will do the X and Y at low
speed.

--- sam | Sci.Electronics.Repair FAQ:
http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
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Default Need help with laser project

Sjouke Burry wrote:
Craig wrote:

I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig



Oh I forgot one way to do this very easily,
glue pieces of mirror to two small loudspeakers,
then bounce the laser form the first mirror to the
next mirror, and use a stereo amp, and music to
move the mirrors/speakers.



That won't do what he's asking, for vector graphics one needs expensive
high speed closed loop galvos and drivers.
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Default Need help with laser project

On Mar 21, 1:55 am, "Craig" wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig


A magnet to scan the field operate in the mhz range and is real
complicated. The exact transform to operate as an x,y or z value may
be operated and the circuit output behave oddly.

If an x,y, or z value is desired to be applied to the laser the
science is applied art.

Here is what I would do to have fun.

A scan coil is removed from the side of the CRT. All the wires
overlapping in the exact geometric center may safely be spread apart.
Making a hole thru which to pass the HeNe tube!

What happens is as you request! And x scan causes the x modulation
frequency of the HeNe , the y the y-mode and z the z-mode.

So you have three channels to modulate with x.

Apply the frequency to the circuit to cause frequency modulation.


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"Craig" wrote in message
...
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig




What about a scan converter ?? sample the high data rate x/y/blank signals
into a buffer with some vector/corner detection to "extract" the useful
coordinates, then output a low rate stream to the galvo scanners, adding
corner points to square things up -- DSP should be up to the vector/corner
detection, and a microcontroller can handle the slow scan output. One of
those DSP/MCU combos should be quite capable of the task.







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Default Need help with laser project

Craig wrote:

I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig

Raster conversion with X and Y smoothed stepper motors (similar to existing
multi-frequency monitors) sounds like the way to go. I could develop it,
but can you afford me (and my team)?
--
JosephKK
Gegen dummheit kampfen die Gotter Selbst, vergebens.**
--Schiller
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Default Need help with laser project

On Mar 20, 10:55 pm, "Craig" wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig


Isn't thise really a 2D problem, not 3D?

I've bought the mirror deflectors from bar code reader at the local
fleamarket. Of course, that is only 1D.

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Default Need help with laser project


wrote in message
ups.com...
On Mar 20, 10:55 pm, "Craig" wrote:
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig


Isn't thise really a 2D problem, not 3D?

I've bought the mirror deflectors from bar code reader at the local
fleamarket. Of course, that is only 1D.


the Z in this case is a TTL blanking signal -- turn the beam on or off while
the scanners poition to the start of a new vector.


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Default Need help with laser project


"Craig" wrote in message
...
I have a project, I am trying to convert the X/Y/Z (blank) signals from a
circuit designed to output to a vector scan monitor and redirect them to
laser either by galvanometer/PC interface/anything possible to active
this..

Can you help direct me to resources or the best way to do this?
This is for a single laser output (one color).
The problem also is that I want to increase the axis range dynamically so
that I can project on a wall, building, anything....

Thanks for any helpful suggestions!
Anyone for hire to help do this???

-Craig




Tried to email you off group but the message bounced -- drop me a line if
you are still looking for someone to take on this project.


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