Has anybody tried one of these?

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Hi,

It looks like a DC bench power supply complete with CV/CC on a mini board when you add a simple AC/DC adapter:

http://cgi.ebay.com/ws/eBayISAPI...

I had no idea these were out there until I ran across them last night. Does anyone use one of these?

Thanks,

Alan

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Looks nice but the power rating is quite low for more than sensor and uC work.

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I could use one of those! Was thinking the other day, "Wish I had an adjustable bench supply."

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

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Hi,

Torby wrote:
I could use one of those! Was thinking the other day, "Wish I had an adjustable bench supply."

Me too. I like to mess around with uC projects from my table and recliner and this should be pretty cool and small footprint. I ordered one so I'll review it when it comes in in a ocuple of weeks. For $11 including shipping how can you go wrong!

Thanks,

Alan

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I will be ordering two myself.

NICE FIND!!

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

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Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Alan

Its not clear to me from the description whether its always in constant-current mode. Can it be in just CC, or just CV, CC & CV? If you wouldn't answering those questions in your review, I would appreciate it.

Also, perhaps a closer shot of the board bottom, so we can see what chips are being used? And what kind of ripple is there since this appears to be a switcher.

Randy

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Hi Randy,

rledyard wrote:
Its not clear to me from the description whether its always in constant-current mode. Can it be in just CC, or just CV, CC & CV? If you wouldn't answering those questions in your review, I would appreciate it.

I'm not the creator/builder of the board, just found it last night while looking around. I ordered one last night, but usually shipping from that area of the world takes 2-3 weeks.

A total guess would be that it works like most bench supplies where you can set the maximum current using the pot and consumption below that results in CV mode and consumption above that results in CC mode.

I'm not sure I'd be so brave as to short the output to set the CC pot though like you can with many real bench power supplies...

Thanks,

Alan

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Hi,

aiwarrior wrote:
Looks nice but the power rating is quite low for more than sensor and uC work.

It says it can handle 2A which is way more than I ever need for the little stuff I mess with.

This one looks like it can handle more current (12A), but I don't think it has CV/CC functionality.

http://www.ebay.com/itm/LED-volt...

Good luck,

Alan

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Quote:
I'm not sure I'd be so brave as to short the output to set the CC pot though like you can with many real bench power supplies...


I'll do it. Send me your supply though ;)

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Hi,

jgmdesign wrote:
I'll do it. Send me your supply though ;)

Isn't that why you ordered 2? So you could blow one testing this??? :)

Thanks,

Alan

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Quote:
Isn't that why you ordered 2? So you could blow one testing this???

Nah,I tend to lose things(except the wife, tried but she keeps coming home). but nice to see you were paying attention :)

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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alank2 wrote:

This one looks like it can handle more current (12A), but I don't think it has CV/CC functionality.

http://www.ebay.com/itm/LED-volt...
Alan

I like it because this one specifically says it has short circuit protection of 14A, although:

Quote:
Description: 100W is the instantaneous power of the module. Not enhance the cooling, the long-running not more than 30-40W.

Which at normal 12V means 3.3A long running which is rather average. The ammeter with resolution of 0.04A seems dubious even though my knowledge of constant current circuits is small

Also do you have any specific application where constant current is absolutely necessary?

Thanks for the link
Paulo Neves

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I risked 11 bucks on one.

Wonder if it'd fit in an altoids tin. I want to put my gabotron in one.

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

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Quote:
Also do you have any specific application where constant current is absolutely necessary?

LED's come to mind....

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Battery charging.

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I picked up a boost converter for just € 4.25, and use it to power a 30W LED from a 12V DC PS. The LED-array needs appr. 30V @ 1A.

Heatsink is from an old PC, active cooling by small fan, auto adjust. Mounted on a tripod.
As you can see, I am redecorating the livingroom, and it's a pain to paint in the evenings as one needs daylight to see what area's have already been painted and which not. This LED-beast allows me to paint in the evenings as well.

Nard

PS For Dutch and Belgian freaks: http://www.samenkopen.net/action...

For others: www.ledsee.com Ask for it if it's not on his website.

Attachment(s): 

A GIF is worth a thousend words   They are called Rosa, Sylvia, Tricia, and Ulyana. You can find them https://www.linuxmint.com/

Dragon broken ? http://aplomb.nl/TechStuff/Dragon/Dragon.html for how-to-fix tips

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Hi Torby,

Torby wrote:
I want to put my gabotron in one.

No pressure, but if you want a PCB I made for my xprotolab let me know and I'll drop you one in the mail. I've got 5 of them laying around doing nothing!

Adds an ESD protection diode across 5V/GND (1N6373G).
Adds a resistor and header for 5V tolerant logic inputs.
All inputs are labeled.
Provides a 1x6 PDI header for easy firmware updating.
Provides a base to place an Xprotolab onto.

Thanks,

Alan

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Right now I'm trying to decide what kind of graphic to use on the tin. http://hackaday.com/2011/10/23/a...

I'm thinking of Gallifreyan writing, like on the TARDIS display.

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

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What does Police Box mean in Gallifreyan?

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Torby wrote:
I risked 11 bucks on one.

Wonder if it'd fit in an altoids tin. I want to put my gabotron in one.

I'll see you and raise you one! Ordered 2 on Monday. Got an email saying they've shipped.

Don

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Hi,

Mine arrived today and I did a little playing around with it.

It has 3 display modes that you can switch between with the momentary left side button - volts, current, alternating. It starts out in volts.

When on volts it can display either the input or output voltage. The push in/push out type button on the right determines this. When pushed in, it appropriately shows the input voltage, when out it shows the output.

Oddly, the light that is marked "CV" seems to also be an indicator of whether the input voltage is displayed (CV led lit) or output voltage is displayed (CV led out). I don't think "CV" is the correct label for this.

The left multiturn pot controls the output voltage as expected and the right controls the output current. I had to turn the right one CCW around 25 times to get it to kick into CC mode with a 200mA dummy load applied. When it kicks into CC mode, the blue CC led lights up. I would say CC led lit = CC mode, CC led out = CV mode.

The trim pot R10 calibrates the current value. Unless I'm missing it, I don't see a way to calibrate the voltage.

It is a pretty cool little board, especially for $11 delivered!

Thanks,

Alan

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Mine was waiting for me on the step with the mail when I got back from the garden today. I didn't expect it so soon.

My power supply read 21.3v. It seems to adjust down to 0.8v and up to 16.2v, and my dvm agrees with the displayed voltage.

I hooked it up to a 3w 24 ohm resistor. At 6v, it indicated 0.25A and at 12v, 0.5A, but my resistor was getting hot as it was dissipating 6w now.

It's about 2 inches wide, 1 1/4 high. It has 4 threaded standoffs. I don't know what thread they are, but a trip to the hardware store would settle that. You can close it up inside an altoids tin with lots of room to spare.

The multi-turn trimpots take a tiny screwdriver to adjust, but make fine adjustment easy. I haven't tried using it as a current source yet. In this mode I would expect it to keep a constant adjustable current, varying the voltage as the load changes.

I'm very pleased with what I got for 11 bucks. This Chinese guy gets my approval. The board is neatly constructed. The blue connector turned crooked when I tightened the screw down on the input wire, but the housing seems to move on the pins. Never did really like that kind of connector.

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut. 

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Hi Torby,

Does yours work the same as mine? Voltage switch pushed in = CV LED lit?

Thanks,

Alan

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Yup. It seems to tell you if you're displaying the input or output voltage

If you don't know my whole story, keep your mouth shut.

If you know my whole story, you're an accomplice. Keep your mouth shut.