Isn't the whole idea of SMPS these days cost reduction and streamlining? Think of how many more of them ships from China per container and product value per pound.
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I have SMPS that lasted at least 6+yrs continuously running @ 80% duty and still tested good.
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If an alarm clock lasted only 6 years, consumer would be highly disappointed. AM/FM clock radio's power supply based on the line frequency steel core and copper wire do not produce interference to the radio and it is very resilient.