How to choose a power supply? Not only radio amateurs and professionals often face this question. The Electronoff online store will tell you about the advantages, disadvantages and characteristics of various power supplies. In our experiment, we will move away from the format of a traditional review of power supplies and will not limit ourselves to just showing models and telling about their characteristics. A power supply http://electronoff.ua/bloki-pitaniya is not bought for one day and for a complete picture it is necessary to know which power supply to choose, and for this we will conduct testing and measurements in different modes. In the experiments, we will use the following power supplies: power supply 9V 1A; power supply 12V 5A (cable); power supply 12V, 3A (cable); power supply SP100A, 24V 5A, metal case. To carry out measurements, we took a popular and in-demand digital multimeter from the MASTECH MY75 CE10 http://electronoff.ua/good/multimetr-... brand. As a load for power supplies we will use the LED strip 5630 72led white http://electronoff.ua/good/svetodiodn... . Power supply 9V 1A http://electronoff.ua/good/blok-pitan... has small dimensions, low weight, which is typical for low-power pulse power supplies and is designed for a voltage of 9 volts and a current of 1 ampere. The disadvantages of power supplies of this type include low power, as well as the lack of protection against short circuits, overheating, and reverse polarity. The next group of power supplies is cable type (connected to a 220 volt network using a network cable). You can connect a 5630 72led white LED strip to a 12V 3A power supply https://electronoff.ua/good/blok-pita..., while the current consumption will be 1.4 amperes. You can already connect two LED strips in parallel to the 12V 5A power supply https://electronoff.ua/good/blok-pita..., the current consumption will be 2.5 Amperes, which is not critical for this power supply. But you can connect two LED strips in series to the 24V 5A power supply https://electronoff.ua/good/blok-pita... in a metal case, each of which will have a voltage drop of 12 Volts (24 Volts in total). The MY75 CE10 multimeter coped with all the measurements perfectly. You can learn more about this and other devices in this series by watching the video “Multimeters MY70, MY74, MY75 MASTECH“ • Digital multimeters MY70, MY74, MY75... . You can buy a power supply http://electronoff.ua/bloki-pitaniya in the Electronoff.ua online store.