PEMENOL DC-DC CNC USB Step Up/Down Power Supply Regulator Module: Adjustable Boost Buck Voltage Converter with Digital Display Voltmeter Ammeter and Battery Capacity Tester Review

As some reviewers have noted, yes there is a lag when changing V output in PER mode. Be aware of this and it's not really a problem. I noticed that some small decimal places are missing (I couldn't get exactly 1.23V), but if you need that high accuracy, just use a precision lab power supply. The test you see in the video is an unloaded voltage. Applications can include direct LED powering or breadboard or even Arduino powering. If you are having trouble getting a link to a manual, you may need…

At first I thought it was a dual voltage USB power adapter. I thought this would be ideal as a +/- power supply for op amps. This confusion was due to the picture. Unfortunately it's only voltage, but I was able to use it on a USB power supply and apply a "negative" voltage. So in the end he does what I want him to do. I also found out later that it also measures volts/amps if you need to monitor project load or battery performance. Pretty handy and a lot easier than the two voltmeter approach.

The finish is decent, it works, the tensions are right. OCP works, tested by shorting the wires, and OPP works under heavy load. The only problem I found is the tedious voltage change, pressing the buttons gives you a 0-0.03 volt change, holding the buttons gives you a ramp but it takes about 24 seconds to go from 1 going from V to 24V and the display often lags needing to go the other way to get to where you really want to be there is no way to change the voltage without turning on the output…

I bought this to have an easy and portable way to check voltage on the go. I like that it works both as an ammeter and as a power supply. It's very easy to use. It has multiple functions: 1) it's a pull-down/boost power supply, 2) it's a voltmeter, 3) it's an ammeter, 4) it's a USB-powered thermometer. It is well made and compact. The buttons aren't impressive, but they are functional and work well enough. It feels comfortable and is reliable. It was a bit difficult to use at first, but once…

In PER mode, the actual output voltage changes faster than displayed. The display is a bit slow to catch up. Absolutely no problem. I was able to get up to 24.5V over USB, but didn't connect a load. I was concerned about the USB port in my computer. The output voltage is pretty close to the voltage reading on my old school multimeter. I believe the measurements were within their margin of error. The VAH mode offers a very simple voltage/power/current meter. The instruction manual included in…