Reddit mentions of DC Power Supply Variable 30V 10A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade
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We found 1 Reddit mentions of DC Power Supply Variable 30V 10A, 4-Digital LED Display, Precision Adjustable Switching Regulated Multifunctional Power Supply Digital with USB Interface, Disply with Output Power Lab Grade. Here are the top ones.
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◆【High Precision, Wide Range】LONGWEI DC power supply is a professional power supply regulation device that designed with crystal clear, backlit 4-digit LED display of voltage, current, and power. Precise accuracy: 00.01V and 00.01A. You can easily tune it within 0-30V and 0-10A. Very durable and easy to observe even in low light conditions.◆【5V/2A USB interface& Auto Power Calculation】What does the USB do? Please don't worry about run out of power now, you can charge your phone, repair phones and more through the 5V/2A USB interface. The hot selling point is that this power supply can calculate output voltage and current into power intelligently and displays the value on its large screen accurately. 110V / 220V input voltage can be switched and can be used worldwide.◆【High Quality with Essential Safety】Safety is our priority. Grounding wire, The power supply takes the function of limited flow protection, overpower protection, over temperature protection, voltage overload protection. greatly improving its working efficiency and lifespan!◆【Excellent Heat Dissipation】Equipped with a big fan controlled by intelligent temperature control sensor and multiple heat radiation grooves on both sides, Intelligent fan offers excellent heat dissipation effect, which reduces the noise and prolongs the life of product effectively.◆【Various Application】This one weighs less than 3kgs and measures only 11.2 x 5 x 5.7 inches, Applies for laboratory, school, home, electronic repair DIY, aging test and other requirements thanks to complete test probes and output cable with alligator clips.
Specs:
| Color | Silver |
| Height | 5.71 Inches |
| Length | 11.22 Inches |
| Number of items | 1 |
| Width | 5.04 Inches |
If you don't have any documentation on the device to determine its power consumption, get a cheap switching DC bench power supply and you can measure how much power the device will draw. You will need to know at least what voltage the device is expecting because overvolting will likely damage it.
You can get a bench power supply that does from 0-30V at up to 5A draw for as low as 60$ on amazon. I got one that does 0-30V up to 10A for about $120.
Here is the one I bought:
https://www.amazon.com/gp/product/B07ML2MP9Q
Attach the lab power supply as the power source, then turn the voltage knob until until the voltage matches whatever the specs indicate (be careful not to overvolt). Turn on the device and the digital readout will tell you how much it is drawing in amps. Take that reading and buy a power supply adapter with 10-20% more to handle spikes in draw that might occur.
Note that "wattage" is just the amps*voltage, so if was at 24V and the readout showed it was consuming 2A, then that would be 48W and buying a 24V 60W power adapter would likely be enough. You can always go higher on the wattage/amps as long as the voltage is correct. Devices will draw what they need, the power adapter wont send more, etc. So, given the example above, buying a 24V 100W adapter would be overkill and likely be more expensive, but it wouldn't damage anything. This is why its great to save old power adapters from laptops and toys as they can be reused in many cases.
Another option to measure draw is to start with a power adapter that provides more than enough wattage, put a voltmeter in series with the circuit and measure the current with the voltmeter. You do have to make sure that the voltmeter you are using is fused for the upper end of your expected current draw. Most multimeters have two current options, a very low current one and a 10A one. The terminals will be labeled as such.