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Old 10-31-2009, 10:54 AM #1
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Default "Homemade" 7W CO2 laser

Hi
A few people on utube told me to become a member and show some of my projects ( I hope some of yu guys already watched one of my vids or maybe two ;-)

YouTube - Burning HOMEMADE CO2 Laser (burning paper, melting ice)

Added a few pics which should have been included on utube.
Attached Thumbnails
"Homemade" 7W CO2 laser-bedienteilforumklein.jpg   "Homemade" 7W CO2 laser-rotco2forumklein.jpg   "Homemade" 7W CO2 laser-co2fullforumklein.jpg  



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Old 10-31-2009, 12:06 PM #2
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Default Re: "Homemade" 7W CO2 laser

Welcome from another new member of this community
I saw your projects on youtube... really cool, especially those related to a pulse laser gun. Do you also make projects on commission?
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Old 10-31-2009, 12:09 PM #3
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Default Re: "Homemade" 7W CO2 laser

Thanks
What exactly do you mean "on commission"? Making a laser you are interested in as well or making a laser FOR you? ;-)
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Old 10-31-2009, 12:32 PM #4
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Default Re: "Homemade" 7W CO2 laser

to the Forum...

Nice video of your CO2 in action...

Don't forget to read the Newcomers section and the Forum Rules...

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Old 10-31-2009, 12:38 PM #5
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Default Re: "Homemade" 7W CO2 laser

Thanks
Already did...

Seems you are a long-time-member...I tried to insert the pics. Did not work. Uploaded them on my webspace. Can you help me with that?
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Old 10-31-2009, 12:49 PM #6
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Default Re: "Homemade" 7W CO2 laser

When editing a Post... you need to click on the yellow Icon at the top of
the Edit Window that has the two mountains in it...
Then copy/paste your URL of the Pictures into that box...

BTW try to re-size any photos so that they are a bit smaller in width than
the Forum full screen...

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Old 10-31-2009, 12:51 PM #7
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Default Re: "Homemade" 7W CO2 laser

Thats what I did. Did not work...size is below 800x600!
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Old 10-31-2009, 01:14 PM #8
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Default Re: "Homemade" 7W CO2 laser

Then try the same Yellow Icon...
But right-click your Uploaded Photo and copy the Properties URL
to the Icon Window like this...




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Old 10-31-2009, 02:47 PM #9
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Default Re: "Homemade" 7W CO2 laser

Tell us more about the components. What's that assembly on the head? Is that a HeNe in the back? What is the control design? It it a Chinese tube?
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Old 10-31-2009, 02:52 PM #10
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Default Re: "Homemade" 7W CO2 laser

Its a "pilot-laser" sitting in the aluminum-cylinder at the front. The beam lays next to the Co2 laserbeam. Just for safety you know. A visible 200mW red beam indicates that there is an invisible Co2 laserbeam.

I used a 7W tube...made in the USA I guess. The inner tube should be made of German Schott glass. Not one of the real cheap chinese sealed tubes from ebay...way to risky..dont trust them actually...heard some bad thing bout them you know.

PSU: A ZVS...pure and simple. One small doorknob cap as filter-cap...works fine.
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Old 10-31-2009, 02:56 PM #11
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Default Re: "Homemade" 7W CO2 laser

Quote:
What exactly do you mean "on commission"? Making a laser you are interested in as well or making a laser FOR you? ;-)
Both ...in the sense that I manage a little bit of electronics, but I'm a disaster to make the casings. Since you're very good at everything I wanted to know even if you sell your works. Anyway congratulations really

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Old 10-31-2009, 07:06 PM #12
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Default Re: "Homemade" 7W CO2 laser

Well thanks...if you have plans how something should look like in the end, show me and we will try to work something out.
You should try soldering some sheets of metal...glueing some plexi...I dont have a shop or something...only a few tools everyone should call his own: Jig saw, buzz saw, a set of files and a dremel-like minidriller.
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Old 10-31-2009, 09:39 PM #13
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Default Re: "Homemade" 7W CO2 laser

ZVS??

I have a 10W tube that needs a power supply.... please elaborate!!
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Old 10-31-2009, 09:50 PM #14
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Default Re: "Homemade" 7W CO2 laser

Quote:
Originally Posted by GooeyGus View Post
ZVS??

I have a 10W tube that needs a power supply.... please elaborate!!
Hi

I think he used a ZVS driver its a circuit using 2 mosfets and 4 resistors and 4 diodes and a cap tank and ferrite core inductor , iron powder cores dont work too well , the zvs needs DC and a fair bit of current changing the value of inductor changes output current and voltage some flybacks just carnt handle the voltages ZVS run from 100watts to 1kw or so , the circuit ossilates back and forth , u put a primary on a flyback and then the zvs drives the flyback to produce HV AC the circuit is very simple very robust to

http://diymania.hv4all.com/zvs%20ih.PNG here is the circuit the work from voltages from 10 to about 60 some have gon to 70 volts the ZVS is zero voltage switching i think the voltage across the fets is zero when they turn on, the zvs is a easy was to get BIG ac arcs for high voltage experiments and that would be able to power the 10 watt co2 no problem just make sure you get a good flyback they are inside CRT tv and moniters the supply HV to the screen , i have made a few of these if u make one you wont be dissaponted also the cap size affects the frequency they run at , good luck , what ive said i think is correct ive made a cuple of them i think this is the ZVS driver he used

Hope this helps GooeyGus

All the best

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Old 10-31-2009, 09:56 PM #15
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Default Re: "Homemade" 7W CO2 laser

Correct. Consists of only a few electrical parts. You should be sure that you feed the tube with max 80W! Mine needs 77Watts...10% more output than rated is still alright.

My next project is a portable CO2 laser....thats gonna get tricky!
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Old 11-01-2009, 01:40 AM #16
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Default Re: "Homemade" 7W CO2 laser

I've built several ZVS flyback drivers and they are certainly very powerful and equal to the task. You might need a ballast resistor to limit current to the tube.
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