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Old 02-14-2013, 05:54 PM #33
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Default Re: Power Supply for a 15W CO2 Laser?

resistance across the pot


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Old 02-14-2013, 05:56 PM #34
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Default Re: Power Supply for a 15W CO2 Laser?

with the pot connected to the power supply?
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Old 02-14-2013, 05:59 PM #35
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Default Re: Power Supply for a 15W CO2 Laser?

yes, but no power is rubbing through it
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Old 02-14-2013, 06:03 PM #36
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Default Re: Power Supply for a 15W CO2 Laser?

the circuit ''behind'' the green connector is skewing your results. if you want to measure the true resistance of the pot, you have to disconnect it from the power supply.

then again, why would you want to measure it when you already know it? you ought to trust your new pot!
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Old 02-14-2013, 06:07 PM #37
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Default Re: Power Supply for a 15W CO2 Laser?

I figured, just like to double check- especially with high power/high cost/fragile devices Off to the store to get some distilled water for the cooling system, with any luck she'll be up and opperating tonight!
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Old 02-14-2013, 06:08 PM #38
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Default Re: Power Supply for a 15W CO2 Laser?

o well, im using tap water in mine
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Old 02-20-2013, 10:51 PM #39
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Default Re: Power Supply for a 15W CO2 Laser?

So, I managed to get to the lab today to test it out. Ended up frying my fuse on the 110-220v transformer. Luckily, there was one at the lab I could use. I hooked it up and wasn't getting anything from the laser. My ammeter would occasionally read 0-1mA, but even turning the pot all the way to let the full 5v flow, I didn't get anything. I wired the pins exactly as Phenol's picture showed, my HV+ is going the the back of the laser (which I assume is the anode) and the front of the laser goes to my ammeter, then to my ground. Anyone have some suggestions?
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Old 02-20-2013, 11:06 PM #40
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Default Re: Power Supply for a 15W CO2 Laser?

I know in the USA, the 2 pin power plugs are pretty damn common, make sure you actually have a solid ground connection, either into your Mains or to something like a pipe in the ground if you don't have a Mains ground.

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Old 02-20-2013, 11:25 PM #41
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Default Re: Power Supply for a 15W CO2 Laser?

I'm using the three pin plugs we've got here
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Old 02-21-2013, 09:49 PM #42
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Default Re: Power Supply for a 15W CO2 Laser?

your power supply has a fuse, is it blown?...
does the mains xformer you are using actually work after the fuse blow?
did you get a description of your power supply with the exact connector pinouts?
check if pin6 of the green connector is actually putting out 5v referenced to pin 4.
i truly hope it's not the case, but if your tube is up to air, chances are that it will never fire.
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Old 02-22-2013, 12:45 AM #43
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Default Re: Power Supply for a 15W CO2 Laser?

And their PSU's really don't like running open circuit due to the huge voltage potential they generate without a load. Could have arced over to the mainboard and thus why a fuse popped. Have you got pics of the tube?

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Old 02-28-2013, 07:27 AM #44
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Default Re: Power Supply for a 15W CO2 Laser?

It's not the tube- I borrowed a friend's hene psu and it worked (not ideal, but the beam turned on). Could be a blown fuse on my psu... I'll try and find some time to go back to the lab soon and check it. Pinout actually was labeled (just had to find the right viewing angle). Phenol's pinout matched what was labeled
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Old 02-28-2013, 06:18 PM #45
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Default Re: Power Supply for a 15W CO2 Laser?

Quote:
Originally Posted by Things View Post
And their PSU's really don't like running open circuit due to the huge voltage potential they generate without a load. Could have arced over to the mainboard and thus why a fuse popped. Have you got pics of the tube?
Ill second this , i ran one of these PSUs open circuit , flashed over and took itself with it , had to buy a new one in the end .
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Old 03-01-2013, 06:54 PM #46
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Default Re: Power Supply for a 15W CO2 Laser?

the datasheet of my psu claims that it has open cct protection, but i somehow doubt that.
one of the TV triplers that I used to power the tube with quickly gave up the ghost when i left it open circuit, even if there was no arcing involved.
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Old 03-02-2013, 02:25 AM #47
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Default Re: Power Supply for a 15W CO2 Laser?

But... the tripler you used isn't covered in the datasheet
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Old 03-02-2013, 04:25 AM #48
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Default Re: Power Supply for a 15W CO2 Laser?

it is covered in it's own datasheet totally independently from the coverage of the psu in its own psu datasheet. i dont think that the rectifier potted in the output tranformer of those psu's is too much different in terms of topology from a tripler, so if left floating, something may fail due to overvoltage
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