![]() Sometimes an external adapter is completely off the table because you need your product to plug directly into the wall, so you have to do the AC/DC conversion on-board. ![]() Sometimes the efficiency loss incurred by dropping from the standard 5V out of an adapter to the required 3V is simple unacceptable in your application. Power supply solutions are not one-size-fits-all. Medical supplies can be several hundred dollars, but have already passed all necessary certifications that can cost a company tens of thousands in agency fees and were designed by engineers with experience in the rigorous standards for medical supplies. When a transformer i tself is a few dollars and an enclosed, UL-certified 5V supply with a cable is less than $10, it becomes impossible to justify the engineering time to create your own.Įven more expensive or specialized supplies are typically worth purchasing in finished form. Standard power supplies are a commoditized product at this point, so it is unlikely that the average consumer will be able to create a cheaper stand-alone supply than they could simply purchase. ![]() Depending on where you live the wall could supply 120VAC at 60Hz, 220VAC at 50Hz, or something in between, but it will always be a large AC voltage that needs to be converted. While most electrical components require a DC voltage, nearly everything needs to plug into the wall.
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