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Because in laymens terms, the regulator provides clean even distributed power throught everything that is plugged into it. You never want to plug into the source with any kind of tech. For the simple reason of power spikes failures and "dirty power" that can harm your tech in anyway. For more info check the link for all the info you would ever want on power supplies and why they are used.

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12y ago

What else can I help you with?