Power Adapter should be regulated or unregulated
When selecting an Power Adapter, you will want to match these as closely as possible.
1、Determine the desired output specifications of the AC Power Adapter. This can usually be found on the old Power Adapter, the electronic device, or the instruction manual of the electronic device. There are two components to this: the voltage, measured in volts, and the current, usually measured in milliamps (ma). When selecting an Power Adapter, you will want to match these as closely as possible.
If an exact match is not available, it is better to err on the side of the new Power Adapter having a lower voltage and higher current than the specifications require. For example, if the device calls for 6 volts at 500 ma, it is preferable for the new Power Adapter to provide 5 volts at 600 ma (lower voltage, higher current) than it would be for the new Power Adapter to provide 9 volts at 333 ma (higher voltage, lower current), as the excess voltage could damage the electronic device.
2、Determine whether the Power Adapter should be regulated or unregulated. Simply put, an unregulated Power Adapter does not always produce the rated voltage while a regulated Power Adapter does. Because of this, regulated AC Power Adapters are also generally more expensive than unregulated ones.
It is possible to substitute a regulated Power Adapter for an unregulated one (the downside being added cost), but it is not advisable to substitute an unregulated Power Adapter in place of a regulated Power Adapter as this could cause the electronic device being powered to fail.
3、Determine the polarity of the AC Adapter, which will either be positive or negative. The following image shows how polarity is usually represented.
Polarity determines the direction that current flows; if the current from the Power Adapter flows the wrong way for the intended electronic device, the device may be damaged. It is important to be sure that the polarity of the Power Adapter and the device match.
4、Determine the size of the Power Adapter plug. Plug sizes are normally measured in millimeters.
If the plug size is the only thing wrong with an Power Adapter, meaning that its voltage and current ratings, whether it is regulated or unregulated, and its polarity all match, it is possible to splice a new plug onto the Power Adapter, as many electronics stores do sell just the plug in different sizes. However, care must be taken to ensure that the new plug maintains the same polarity as the old one, meaning that the wire that connected to the outside surface of the old plug still connects to the outside of the new plug, and that the wire that connected to the inside surface of the old plug still connects to the inside surface of the new plug.
5、Choose an AC Adapter that meets all of the above four requirements:
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