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Old 08-10-2017, 02:45 AM #1
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Default Power Supply Recommendations

Hi everyone.
I'm looking into purchasing a DC power supply.

Can anyone make any recommendations regarding what I should look for in a power supply?
What are some useful features?
How clean should the output be for laser diodes?
Anything else to think about?

I'd like to use it for testing laser diodes at a minimum and I am willing to consider more expensive options if there is a significant difference in quality or important features. Good value is definitely preferred.


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Old 08-10-2017, 03:25 AM #2
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Default Re: Power Supply Recommendations

I don't presently have a link, but you want a very clean and constant current and voltage supply with coarse and fine adjustments for both. You will probably want a 10 amp 30 volt supply as this will give you more options to test many diodes. If you get one used, it will be necessary to clean the pots and switches well as any noise can cause diode failure. It would be best if the leads zero out when turned on at 0 volts and 0 amps. Otherwise you will need to short them every time you turn it on before connecting to the diode. I use transistor sockets so it isn't necessary to solder on your diodes. You should be able to find one for ~$100.00 I would think. Better ones cost more. Sometimes much more.
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Old 08-10-2017, 11:52 AM #3
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Default Re: Power Supply Recommendations

welcome back stranger..

this is a good time to get a great deal on a used PS.. reason? for me- I got a 3Amp that DTR was no longer using $40 shipped-- powers were going up and up. so if you are OK with less amps --I bet you would get some replies to a WTB thread.. I also jumped up to 5 amps and now that is not keeping up wit the 7 watters .. same with LPMs.. have you seen the one for $75?? PM me.. len
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Old 08-10-2017, 07:44 PM #4
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Default Re: Power Supply Recommendations

Here is a link to a 30 volt 10 amp adjustable power supply that ships from the US, new for $54.99. I have one and have gone through it with my scope and it is very clean, though some here have said they are too cheap. I have used it to test many laser diodes without any problems.

DC Power Supplies 30V 10A 110V Precision Variable Digital Adjust w/Clip Cable
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Old 08-11-2017, 12:53 AM #5
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Default Re: Power Supply Recommendations

Thanks, guys.
I appreciate the input.
I think I want a new PS rather than a used one.

Hak - it's nice to be back.
Paul - I appreciate the link! Do you find that the transistor sockets are pretty reliable?
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Old 08-11-2017, 01:06 AM #6
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Default Re: Power Supply Recommendations

You probably don't need the 30 volts, so if you can find a 15 volt model with the same current at a lower price that would be preferable.

Also be careful with ones like the one linked in above.

There are tons of virtually identically looking ones on the market with numerous brand names, some real, some fake, some good and some bad.

If you have any option to get one from a place you can return it to free of charge, i'd go for that. You can measure things like power-up output spikes and prescence of large output caps (which are good thing for most applications, but not directly driving laser diodes!) quite easily with a dummy load and scope.

These properties are especially important when directly driving laser diodes, and could make an otherwise perfectly fine power supply useless for the purpose.

Consumer reviews will also be of little help there, those properties are no problem for the vast majority of users that just power up any electronics project. They will just look for the thing meeting max output specs and not overheating in the process, which some of them do.
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Old 08-11-2017, 01:57 AM #7
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Default Re: Power Supply Recommendations

Quote:
Originally Posted by RA_pierce View Post
Thanks, guys.
I appreciate the input.
I think I want a new PS rather than a used one.

Hak - it's nice to be back.
Paul - I appreciate the link! Do you find that the transistor sockets are pretty reliable?
I chose that particular link because it ships from inside the US. If you find you need to return it, you needn't send it to China. The sockets I use work very well for all the diodes I have tested. Some are high power diodes, others not so much. I never solder to a laser diode that I am testing any longer because I just don't need to. I have yet to lose one with the socket. I do solder leads onto the sockets though.
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445nm 2.2 watts Nichia MS Envy

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477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
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650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
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Old 08-12-2017, 12:01 AM #8
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Default Re: Power Supply Recommendations

Quote:
Originally Posted by paul1598419 View Post
I have one and have gone through it with my scope
What exactly have you measured? Is your scope capable of single shot capture? What about roll mode?
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Old 08-12-2017, 12:54 AM #9
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Default Re: Power Supply Recommendations

It does have a single shot, but not being a DSO, it doesn't have capture or roll mode. Roll mode, while being nice to have on a DSO is not necessary unless you want to do a running strip-like display of low frequency transitions from 5 ms or lower. I have been able to measure the immediate single shot of the PS at the time of turn on and also measure the noise level under load of changing voltages and currents. I have also measured these transitions while using a LD as a load to see any spikes or noise transitions while moving through the constant voltage and current levels without seeing anything out of the ordinary. Having done these things I can also report that I have yet to lose a diode while powering with my PS that is quite similar to the one I linked to.
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445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM

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Old 08-14-2017, 11:11 PM #10
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Default Re: Power Supply Recommendations

Quote:
Originally Posted by paul1598419 View Post
Roll mode... a running strip-like display of low frequency transitions from 5 ms or lower.
No, the frequency response of the roll mode depends on the scope's memory and time base. 5ms/200Hz response on a 0.5s/div timebase with a division count of 12 would mean a memory depth of 2400 points. That's just silly. Even a $200 scope has 1Mpts of memory.
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Old 08-15-2017, 12:34 AM #11
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Default Re: Power Supply Recommendations

Yeah, that was a typo. I meant 500 ms/ div or slower. Agilent, or what used to be HP will automatically kick out of roll mode at sweep rates higher than that. This is based on the DSO5000, DSO6000, and DSO7000 series scopes. But, I thought the purpose of your calling me out was that you thought this PS was not going to be up to the task of testing LDs. I still believe I have given enough information to show that it very well might be just fine. I know when I bought mine the specs were stated for the unit and before I used it I tested it to make sure.
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405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 1.75 watts SkyRay Gifted
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM

Last edited by paul1598419; 08-15-2017 at 01:01 AM.
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Old 08-15-2017, 08:59 PM #12
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Default Re: Power Supply Recommendations

There's no need to get defensive. I was just asking for clarification, not "calling your out". The roll mode was a tangent.
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Old 08-15-2017, 09:37 PM #13
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Default Re: Power Supply Recommendations

No problem, Cyp. If I mistakenly took your question wrong I apologize.
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405nm Laser Pointer 45mW
405nm C11 700mW
405nm Laser Shack Pointer 80mW
Thor H Dual Power 445nm, 438 mW & 1648 mW
445nm 1.75 watts SkyRay Gifted
445nm 3 watts MS-SSW-II
445nm 2.2 watts Nichia MS Envy

445nm 2 watt SMP Copper Host
477nm 127 mW 501B
488nm Uniphase #2201-20SLAT argon laser head and power supply >40mW
520nm LaserLands pointer Measures 510nm
532nm LSR532H-1W Laser, LSR-PS-N1 Driver, RS-75-5 P.S. 1300 mW
532nm 200mW Thermostatically Controlled Fan Cooled (Besram) >230mW
532nm 189mW pocket lab laser
532nm lasers X6 100mW-200mW
532nm lasers X4 75mW- 140mW
632.8nm P210 New Laser Tube 0.57mW Melles Griot 05-LMP-827-037 PS
632.8nm Spectra- Physics He- Ne #102-2 4mW heads X2 and #236 power supply
632.8nm PMS He-Ne # 201P/ LPS-115 2mW
632.8nm Siemens HeNe LGK7630S 7.6mW
635nm 1 watt Cyprus II
635nm 1 watt SMP Copper host
635nm 5mW pointer
635nm 100mW pointer
635nm Lifetime17 Mini-camo build 687mW
650nm 65mW pointer
650nm 380mW 501B
808nm 1+W infrared laser
infrared video camera for collimating IR lasers
Ocean Optics USB2000 Spectrometer
Scientech Vector S310 with AC2500 10 Watt LPM
LaserBee II 3.2 Watt LPM
Radiant X4 3.7 Watt LPM
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