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Old 05-04-2013, 04:16 PM #1
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Default HeNe Power Supply Not Working!!! Help!

I purchased THIS power supply to go with this Tube:




The schematic included stated it needed 4.5-6V in @ 1.0-1.3A. So after perusing Fry's for awhile and not finding anything really I thought: 4 AA Primary Batteries is 6V! And I am sure it could handle the 1A Draw, so I bought a Project Box and a 4xAA Holder(Series). I have hooked it all up and I am getting nothing.

What do yall think I did wrong? This is an edit off a previous post so skip down to post 8 or 9 if you need to see something related to this.

Thanks,
Isaac


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Old 05-04-2013, 04:40 PM #2
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Default Re: PSU for Bare HeNe Tube? How to connect?

A PSU like this will work for that little beauty
Helium Neon Laser Power Supply 5VDC HeNe Tube High Voltage He NE | eBay

With that one, you just slip the ring that is soldered onto the red wire over the anode
It already has the ballast resistor on it

Then you attach the black wire to the cathode
You can do that by soldering a ring like the red wire, or a clip, or a snap ring, or you could even just wrap a bare portion of the wire around the end

The voltage is high enough that you don't need a soldered connection
When I test bare tubes here, I just lay the end of the wire on the resistor over the end

Peace,
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Old 05-04-2013, 05:12 PM #3
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Default Re: PSU for Bare HeNe Tube? How to connect?

shoot, isaac - i forgot about the resistor. i have one if you need it. all out of spare alden's tho. i was hoping that sending the tube would get you reading up and learning more. in your pic of the tube the negative end is on the right - the end with the yellow sticker.
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Old 05-05-2013, 09:13 PM #4
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Default Re: PSU for Bare HeNe Tube? How to connect?

Don't forget the Bible of all laser info on the subject.
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Old 05-05-2013, 09:23 PM #5
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Default Re: PSU for Bare HeNe Tube? How to connect?

Yeah I have been reading on there a bunch. Seriously I want to download every page as a PDF and keep it on a thumbdrive. And Daguin, I went ahead and purchased that PSU! Thanks for the suggestion!
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Old 05-06-2013, 11:13 AM #6
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Default Re: PSU for Bare HeNe Tube? How to connect?

BTW... the Cathode end is usually the end attached
to the metal tube covering the capillary tube part
way.


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Old 05-09-2013, 01:22 AM #7
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Default Re: PSU for Bare HeNe Tube? How to connect?

Okay so if someone will take a look at the link Dave posted above...that is the PSU I bought. It arrived today, and as you can see in the picture the power input for the Power Supply is a bucnh of wires going in to a black connector thing. I read the schematic on the power supply and so I know which wires I need to connect to power source. Should I remove the wires from the black thing or is there a cable I should buy? Also, the PS specifies 4.5-6V DC in so would an adjustable wallwart DC converter work?


Also, would you folk recommend putting the powersupply and all external cables in a small project box to keep it tidy?

Thanks,
Isaac

EDIT: If I did the project box I could also add a switch in series to make it more convenient, aye?
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Old 05-09-2013, 02:28 AM #8
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Default Re: PSU for Bare HeNe Tube? How to connect?

Quote:
Originally Posted by wannaburnstuff View Post
Okay so if someone will take a look at the link Dave posted above...that is the PSU I bought. It arrived today, and as you can see in the picture the power input for the Power Supply is a bucnh of wires going in to a black connector thing. I read the schematic on the power supply and so I know which wires I need to connect to power source. Should I remove the wires from the black thing or is there a cable I should buy? Also, the PS specifies 4.5-6V DC in so would an adjustable wallwart DC converter work?


Also, would you folk recommend putting the powersupply and all external cables in a small project box to keep it tidy?

Thanks,
Isaac

EDIT: If I did the project box I could also add a switch in series to make it more convenient, aye?
Just cut that connector off.
The wallwart will work *if* it gives enough current for the PSU
Sorry. I don't remember what it needs
I used a 2A bench PSU for these little PSU's but I am sure that was overkill

Placing it all in a project box would be fine
Those PSU's don't really produce much heat

Peace,
dave
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Old 05-09-2013, 02:35 AM #9
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Default Re: PSU for Bare HeNe Tube? How to connect?

Just kook at the second and fourth photos in the listing;

Red is 5V, Yellow is TTL enable - tie it to 5V to turn on output. Either. Black is negative or HV return.

Either switch yellow to red and red to 5V (for two switches - pwr & enable) or tie them and switch them both to the 5V line.
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Old 05-10-2013, 03:58 AM #10
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Default Re: HeNe Power Supply Not Working!!! Help!

New problem!!! Help me ye gods of lasing!
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Old 05-10-2013, 04:57 AM #11
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Default Re: HeNe Power Supply Not Working!!! Help!

Disconnect the tube and try the PSU by itself. See if you can get any sparks between HV out and ground. HeNe PSU's are constant current sources and the tube is a negative resistance load so just leave the ballast resistor attached and it should not harm the psu to spark once or twice, just don't do it much.
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Old 05-10-2013, 05:05 AM #12
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Default Re: HeNe Power Supply Not Working!!! Help!

I disconnected the tube and tried putting the two wires that go to the tube on each other and nothing. Is it a problem with using AA's???
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Old 05-10-2013, 06:53 AM #13
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Default Re: HeNe Power Supply Not Working!!! Help!

Measure the current draw from your cells.
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Old 05-10-2013, 06:58 AM #14
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Default Re: HeNe Power Supply Not Working!!! Help!

You're still trying with AAs? No wonder. They have too high of impedance and the voltage drops under such a heavy load. They can supply 6V and they can supply maybe 1500mA but not at the same time!

You need another power source. HeNe Bricks typically draw about 1.2A @ 12V, assuming similar efficiency and output you would need 2.4A @ 6V; well over what AAs can deliver. You might be able to try using four D cells, it might run it for a few minutes or so.
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Old 05-10-2013, 01:46 PM #15
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Default Re: HeNe Power Supply Not Working!!! Help!

Okay so how do I run this ***y thang then? The schematic said it wants an input of 4.5V-6V @ 1.0A-1.3A. All I can think of is that I am going to have to buy an actual PSU and set it each time I want to run my gas laser.....
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Old 05-10-2013, 02:08 PM #16
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Default Re: HeNe Power Supply Not Working!!! Help!

Quote:
Originally Posted by wannaburnstuff View Post
Okay so how do I run this ***y thang then? The schematic said it wants an input of 4.5V-6V @ 1.0A-1.3A. All I can think of is that I am going to have to buy an actual PSU and set it each time I want to run my gas laser.....
Just get a walwart that puts out about 2A @ 5VDC

Peace,
dave

http://www.ebay.com/itm/5V-2A-Switch...item3a7ff446ac
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Last edited by daguin; 05-10-2013 at 02:11 PM.
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