SHNITPWR 60W Universal Power Supply DC 3V 4V 4.5V 5V 6V 7V 7.5V 8V 9V 10V 11V 12V Adjustable Variable Power Adapter 100V-240V AC to DC Converter 1A 2A 2.5A 3A 4A 5A with 14 Tips & Polarity Converter

I purchased this to power a phono pre-amp that didn't come with a D/C adapter. It works well and has a large variety of plugs to adapt to different devices. The adjustability of the voltage seems fine, the low end is different than the high and the knob moves a lot more in this range, this may be a function of the potentiometer or just a general way the electronics work. You can still get super accurate adjustments along the full range (other reviews mentioned issues with this).It seems well made and most important to me had no noise (the other preamp I was replacing developed a low hum and I couldn't tell if it was the amp or the power supply), this worked great with the new preamp and so I tried it with the old preamp and the sound was greatly improved.One little tip... if your device has a range of voltages it will work with listen to it through the different ranges (ie: from 5v-12v or 9v-12v is common), you might be surprised where the components sound best!

I brought a laptop home to the states from Ireland where they have a different power cord plug. To use the laptop I needed a new cord, but was unsure what to get for this no name laptop. The universal power cord was ideal. I was able to find the right size plug to go into the laptop, and I was able to dial the right voltage. Saved me from getting a new laptop.

works well but not for what i purchased for

Lots of connecters. Varable voltage rate.Would purchase again.

The unit's voltage can be dial set to 3 digits. It is very compact for bench top use or for service calls and has an exhaustive set of polarity switchable connectors. When tested underload it delivered 5 amperes at all voltage settings. It is an exceptional value for the price.

This is a great example where bad design choices result in a defective product.This power supply has a single control: a knob that turns on the device and also selects the voltage. The knob isn't even labeled.The problem should be obvious from that simple description: It is not possible to turn on the power supply at a desired voltage. You have to turn it on and then select the voltage.If you happen to have an electronic device plugged into it, what do you suppose is occurring? You're supplying it with a range of voltages, starting from zero and scaling up to the desired voltage. If you happen to overshoot (because, y'know, it's just an analog knob), then you are supplying the device with overvoltage.Electronic devices aren't designed to cope with a wide range of voltages. They are sold with a power supply that supplies (x) volts... The End. Supplying the device with (x/2) volts, or (1.5 * x) volts, or a voltage that varies wildly over a set period of time, is an excellent way to ruin the device.Sure, you could set the voltage and then plug in the device. Or you could plug in the power supply, set the voltage, unplug the power supply, plug in the device, and plug in the power supply again. Both are stupid hacks to overcome an obvious deficiency, which is:Why doesn't this product include an On/Off switch?That's all it would have taken. A single-pole, single-throw power switch or button. Probably would've cost an extra $0.05 per unit. But no, they had to take the cheap way out, even if it meant frying the devices that this power supply is intended to power.BONUS: Sometimes, plugging in the power supply momentarily produces alarming readings, like 60 volts. The maximum rated voltage is 12 volts. Why is it supplying 60 volts? Bad voltage regulation, obviously. Another risk to the product.This power supply is toxic to sensitive electronics. Avoid avoid avoid avoid avoid.

This unversal power supply adapter works well and supplies the voltage expected. Like all these universal power supplys they have multiple connectors which are necessary but tend to be a bit short. Overall it works well.

I bought this power supply to test the electronic devices I build because of its reported power output and adjustability. So let's start with the positive.This power supply does, indeed, provide power. When tested with a reliable multimeter, the voltage displayed on the LED readout is what the multimeter reports. So that's a significant positive.Now, let's move onto the negative.The power seems flaky at best. I haven't taken the device apart yet, but judging by its weight, the power output is most likely PWM, and if the frequency is too slow, more sensitive devices will have a problem with it. A perfect example is found right here, in the advertising: the Raspberry Pi.After running into a number of small, inexplicable glitches in one of my projects, I placed it on hold and switched this power supply to my Raspberry Pi 3B+. That's when the kernel began complaining of low voltage. The LED read 5.1 or so volts and never dropped below it, so I increased the voltage to 5.4 volts. The kernel messages for low voltage went away, but would come back intermittently. So I bought a dedicated 5V, 3A power supply for the Pi and so far, no low voltage kernel messages. So that's a knock on it right there...Next, the dial to adjust the voltage is touchy. Very touchy. It's nearly impossible to get 5V; you'll usually end up with 4.87V or 5.22V or some other "close but not exact" values. Great for checking the voltage but bad if you want to find voltages that are too low for the device. Also bad for electronics where the dial gets bumped or nudged from 5V to 7V and the magic smoke gets released.Overall, it's a good design and will definitely worth for most devices. Just be aware that it may not work for you, if you need reliable power.