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!

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 had to return this mainly because the primary use I had for it was for a rechargeable razer. The problem is the base of the adapter for the size it uses, is too fat to fit into the razer.The base (the black part the adapter end protrudes from is 0.39" at the smallest and 0.46" when you get closer to the end that plugs into the adapter. I only take the time to explain this as it wasn't on my radar at all. All the round ones seem to have the same size base.I also was not a fan of how fiddly the voltage adjustment was. Dialing in a specific voltage isn't as easy as you'd think. The adjustment is by 100th of a volt. This seems like overkill. Notches (as another reviewer suggested) would be nice, but just making it so it would go up by a 10th of a volt, would probably be sufficient.

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

The thing is good and works well. Only thing would have been nice to have an instruction book to let someone know how to use the converter and when, also it selects the voltage on the display automatically when you plug it into something and power it on, you don't need to select the voltage on the display yourself like I had thought. That's intelligent I liked that aspect anyhow.

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.

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.