The following information can be found on the label of most power adapters:
Part number / model, input, output
It should be noted that there is a positive center identifier on this label, which indicates that the center line is connected to the positive. Although this is a common configuration, it is important. If you replace a negative center adapter with a positive center adapter, you may damage the circuit.
However, sometimes we may not be able to find the same type of adapter from the installation type on this adapter. At this point, we need to look at some other information. Firstly, according to the above information, we know that we need 12VDC output, so 12V is selected.
Next, you need to select the output current of the power supply. The output current in the template is 1a, but in order to have more choices, it is recommended to select all output currents greater than or equal to 1a.
be careful! In most applications, you can choose a power supply with a higher output current. There will be some power loss during the output of the power supply. When outputting 900mA, a power supply with an output of 1a is more efficient than a power supply with an output of 10A.
In the selection of alternative materials, the size and type of output connector of power supply are more important. Round pipe plug is the most common type of output connector. This type has many different sizes. For this type of connector, the outer diameter is the best confirmed, which can be used as a reference for the selection of common inner diameter of 2.1mm or 2.5mm.
After testing, it can be confirmed that the inner diameter of the connector I need is 2.1mm and the outer diameter is 5.5mm. According to the previous label, I know that my polarization is the positive center.
If you are not sure whether the wire end is correct, you can splice the old wire end to the new wire.
Usage region: this parameter is related to your power input connector. It should be noted that some international models will not provide patch connectors, while some models will provide many patch connectors. In addition, some desktop adapters have input lines, while others do not.
Adapter form: you need to confirm whether the adapter form is desktop or wall. Generally speaking, due to the size, the desktop is used for those with large current.
Input type: on a desktop model, you need to check whether it has a power cord or is sold separately. On the wall type models, some have fixed inserts, and some also have multiple inserts sold separately.
No load power consumption: any power supply plugged into the wall may consume power even if there is no load power supply. This rating shows the maximum power when the power supply is plugged into the wall instead of the output power supply
Although the above search examples are based on specific parameters, you can still search for any AC-DC power supply according to your needs
