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Old 05-24-2010, 09:56 PM #1
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Default To oudin or not to oudin...

Hello all,

Well, as this is my first post I guess I should say hi! I suppose my question is in the title... but of course there is preamble

I recently got hold of an argon head / power supply combo (JDSU type, 20mW 488nm single line) which does 5mW at 4.2A, 20mW at 6.3A and 45mW at 8A (max rated tube current). It's a great thing

I also have an old Cyonics (about 10 years old!) head with a similar design to my newer JDSU head, i.e. same filament current / similar tube voltage and current specs which I'm trying to drive off the same PSU. However, predictably, it won't start. Use an oudin coil I hear you cry!!! And herein lies the question... will an oudin coil fry my lovely new switchmode power supply?

Technical details, the PSU is a 211OU-SLCBCC and came with a 2211-20SLE head. The laser I'm trying to start is a Cyonics 2201-20SLB rated at 105V / 10A (I think!).

Anyway thanks in advance, I'll get some pics up soon too!


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Gots:
405nm 25mW diode
2x 488nm 20mW argon
532nm 180mW DPSS
2x 632nm HeNe, .3mW, 4mW
658nm 220mW diode
Dye laser w/various line optics (but no pump )
-------------------
Wants:
808nm >500mW diode
405nm >200mW diode
ArKr Multiline (10A / 100V ish head)
HeCd multiline
-------------------
Gonnabuildatsomepoints:
N2 superirradient to pump the dye laser
Big CO2
Modify the .3mW HeNe to mode stabilised
HeCu pulsed
Probably not in that order!

Last edited by jasonp; 05-24-2010 at 10:12 PM.
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Old 05-24-2010, 10:41 PM #2
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Default Re: To oudin or not to oudin...

Off topic, but I read your sig, and since you know about laser, I will give you this link, it's rated at 500mW but you may still want it
500mw OEM 808nm 5.6mm diodes ! [Stonetek808_500] - $15.99 : StoneTek Electronics, Your Laser Parts Store
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HeNe/gas reference thread
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Old 05-24-2010, 10:48 PM #3
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Default Re: To oudin or not to oudin...

[OT] thanks for that diode link I figure it's always good to shop about!
__________________
-------------------
Gots:
405nm 25mW diode
2x 488nm 20mW argon
532nm 180mW DPSS
2x 632nm HeNe, .3mW, 4mW
658nm 220mW diode
Dye laser w/various line optics (but no pump )
-------------------
Wants:
808nm >500mW diode
405nm >200mW diode
ArKr Multiline (10A / 100V ish head)
HeCd multiline
-------------------
Gonnabuildatsomepoints:
N2 superirradient to pump the dye laser
Big CO2
Modify the .3mW HeNe to mode stabilised
HeCu pulsed
Probably not in that order!
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Old 05-24-2010, 10:51 PM #4
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Default Re: To oudin or not to oudin...

Kick the tube with your oudin

If you have an oudin, I assume you know how to use it.

I have never had this action "bleed back" into the PSU.

I have had it shut down my wireless network though

Peace,
dave
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Old 05-30-2010, 08:10 PM #5
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Default Re: To oudin or not to oudin...

Hey,

I've been given one link by Diachi for sourcing an Oudin coil but does anyone have any other suggestions as to where to find one? Any 2nd hand ones around on the forum?

Oudin coil. Anything to do with Norse gods?

M
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Old 05-30-2010, 08:58 PM #6
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Default Re: To oudin or not to oudin...

Quote:
Originally Posted by bloompyle View Post
Off topic,
What else is new?
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Old 05-30-2010, 10:17 PM #7
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Default Re: To oudin or not to oudin...

For those who didn't knwo what I meant, in his sig he said he wants a >500mW 808nm IR diode. Which is why I posted that, for those who were confused.
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442nm 15mW Melles Griot HeCd
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496nm Tunable OMNI 532
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589nm 126mW PGL-III-C
594nm Rigel-6; 4.75mW + <1mW
604nm 2x <1mW multiline
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638nm 20mW single mode
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647nm ~10mW ArKr whitelight Kr line
650nm Raman 6 line
658nm LPC-826
685nm 20mW
808nm Modded NewWish pen


HeNe/gas reference thread
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Old 05-31-2010, 12:37 AM #8
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Default Re: To oudin or not to oudin...

We know...
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Old 06-01-2010, 07:09 PM #9
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Default Re: To oudin or not to oudin...

At first I would try to heat the tube up with a hairdryer and then try to start it again. Sometimes this helps and it's easier than to risk the semiconductors of your power supply. If it doesn't start at all and you tried several times, you could still try harder ways to push your tube.

Best regards
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Old 06-01-2010, 07:41 PM #10
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Default Re: To oudin or not to oudin...

Quote:
Originally Posted by argon View Post
At first I would try to heat the tube up with a hairdryer and then try to start it again. Sometimes this helps and it's easier than to risk the semiconductors of your power supply. If it doesn't start at all and you tried several times, you could still try harder ways to push your tube.

Best regards
Argon
I've never had any luck with the heat gun technique. Not that it might sometimes work...

In 20 years of doing this, I have only damaged a system once, and that was the little light board in the head. I replaced the 2n2222 and away it went.

A proper BD series coil used near the heatsink would almost NEVER do semi damage, provided the power is already on. Reason? The semiconductors are already conducting, and the low pass filters on a properly made laser power supply prevent the HV from getting back to the FETS/NPNs.

BTW, one of the secrets to using a OUDIN coil is using it at minimum current, ie just turned on. Too much usually inhibits cathode spot formation by making the initial discharge unstable.

Steve
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Old 06-01-2010, 07:46 PM #11
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Default Re: To oudin or not to oudin...

Quote:
Originally Posted by LSRFAQ View Post
I've never had any luck with the heat gun technique. Not that it might sometimes work...

In 20 years of doing this, I have only damaged a system once, and that was the little light board in the head. I replaced the 2n2222 and away it went.

A proper BD series coil used near the heatsink would almost NEVER do semi damage, provided the power is already on. Reason? The semiconductors are already conducting, and the low pass filters on a properly made laser power supply prevent the HV from getting back to the FETS/NPNs.

BTW, one of the secrets to using a OUDIN coil is using it at minimum current, ie just turned on. Too much usually inhibits cathode spot formation by making the initial discharge unstable.

Steve
THAT is a gem I have never heard before. Thanks

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Old 06-10-2010, 01:58 PM #12
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Default Re: To oudin or not to oudin...

Zap it!!

The power supply will be fine, just dont go hog wild. Like the previous poster said, turn the knob until you just start to hear it crackle (barely on) and give her a zap on the heat sink fins near the anode end (watch out for the voltage levels present at that end of the tube).

I've shocked a lot of stuff into life with my BD-10A... best money I've ever spent!!!

Also as a side note, be careful while using those around electronics. While I was using mine once, I saw my TV remote control lighting up about 5 ft. away. Every time I turned the coil on, the buttons on the remote would light up. Needless to say, the remote no longer works correctly, and it didn't even come within 5ft of the coil.
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Old 06-10-2010, 02:52 PM #13
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Default Re: To oudin or not to oudin...

... Good place to find a coil... ? 2nd hand maybe?

M
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Old 06-11-2010, 03:02 PM #14
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Default Re: To oudin or not to oudin...

Quote:
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... Good place to find a coil... ? 2nd hand maybe?

M
Guess what holds their value better then a rust free, 1974 VW BUG.

You want a BD-10A, or similar, you can check Ebay, but its often cheaper to just buy one.

Electro-Technic Products Inc. Leak and Pinhole Detection

I'm shocked that 300Evil's coil killed something at 5 feet, these things are not that energetic at all, I'm betting it was a "soft" kill and the thing's microprocessor overwrote its own flash memory.

But one should handle them with respect and away from one's sensitive gear, or around computers with the case off, etc.

A solidly grounded outlet with conductive conduit in the wall is a good idea.

Steve
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Old 06-11-2010, 07:20 PM #15
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Default Re: To oudin or not to oudin...

So these things will kill a PHR then? j/k

Thanks for the link Steve.

M


P.S. 300Evil is GooeyGus?
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Old 06-11-2010, 08:57 PM #16
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Default Re: To oudin or not to oudin...

zap the anode end with the oudin, the big choke will take care of any danger to your PSU.
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