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Proving yet again that I suck at the mechanical / industrial design side of things...

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Biny
 Biny
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...my rough layout of my "laptop brick bench power supply" as per Bill's vid. Can't cut a decent square hole to save my life, lol.

(the red writing is on the photo, not the case)

Screenshot 2022 03 25 122915 (Large)

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Will
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@binaryrhyme

Looks good.

Is the case grounded (sort of looks like plastic) ?

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Biny
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It's plastic, yeh. The power brick is grounded on the AC side, obviously. 19v DC coming in from the brick.

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Ron
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@binaryrhyme Nice job, I also built one with 3.3, 5, 12, Var but didn't put meters on the first 3, my case is too small.

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Biny
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@zander Yeh, I wanted the meters so I could calculate power drain (and see if anything was terribly wonky). I suspect there are many of these in the world thanks to Bill's vid. 😉

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Will
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@binaryrhyme 

Very nice. I made a much smaller version because I don't need much current for my testing ...

IMG 1871

 

Green is 3.3V, blue is 5V, black is ground, red is adjustable. Case was 3D printed. Powered by 12V 4A wall wart.

IMG 1877

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Ron
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@will Also very nice, I envy those with 3D printer capabilities, it's so hard to find a right sized case and at any kind of close to reasonable price.

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Ron
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@binaryrhyme Now you are making me think I need a small case with a meter and just a in jack and out kjack to measure the power. Thanks for the inspiration! Can you give me a source for your meters, I assumne onbe part measures all 3 voltages.

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Will
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@zander 

They're a great gift, especially for someone as useless as I am with hand and power tools. about the only thing I was proficient at was supplying blood samples for my microscope 🙂

But of course there is always a downside and with 3D printers it's that they work on a narrow plateau of electronic and mechanical setup and they tend to slide off on one direction or another frequently. So, you will need to allocate a certain amount of hours to troubleshooting and maintenance when you get one.

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Biny
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@will Really nice job, Will. Yeah, I'm getting an itch for a Prusa, lol.

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Biny
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@zander The ammeter needs to be in series, so your mini box will probably need to be an insert. Yeh, I got them on Amazon.ca - I haven't tested them for accuracy yet, but the price was right. 😉

Eiechip LED Digital Voltmeter Ammeter DC Digital Multimeter 100V 10A Blue Red LED Amp Dual Digital display Volt Meter Gauge Car Current Monitor Tester 0.28" inch, Voltage Testers - Amazon Canada

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Ron
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@will What kind of prices do those things go for? Since I totally suck at CAD I am not so sure I will ever get one, but I just saved $5,000 on a purchase so do have some loose change rattling around. Also, any brands to steer clear of and to favour?

I know I can google all that but it's nice to be able to ask a friend who has one and experience.

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Ron
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@binaryrhyme Yes, positive from existing power supply into the meter box and the output from the meter box is now the positive. In series as you say. Is there another way? Up till now I use my clamp on meter, but a meter box is less space, I will stick it on top of my power supply.

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Biny
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@zander The Prusa is highly regarded, and comes in kit and assembled form. It's the one on my wish list. It's more expensive than some of the more entry level models, and much cheaper than the high end jobs. 🙂

Original Prusa 3D printers directly from Josef Prusa

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Biny
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@zander Wiring diagram is in the amazon photos. 😉

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