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Why do some devices have external power supplies and some do not?
Asked by Charles (4823)
March 6th, 2012
Laptops, portable CD players, electric pencil sharpeners, ...anything that you plug a transformer into an outlet have external power supplies.
Radios, stereos, blenders, toasters, clock radios, plug straight into the home outlet.
Most electrical devices need the +5V or +12V DC or whatever but some of them have that power supply built in and some do not?
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