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Why must this DIY lab bench power supply be powered by an AC supply? - Electrical Engineering Stack Exchange
![DC Bench Power Supply Adjustable 30V /10A, 3-Digital Switching Regulated Lab Mini Power Supply Single-Output 110V, with Alligator Leads, for DIY Electronics Testing, Repairing& Researching: Amazon.com: Industrial & Scientific DC Bench Power Supply Adjustable 30V /10A, 3-Digital Switching Regulated Lab Mini Power Supply Single-Output 110V, with Alligator Leads, for DIY Electronics Testing, Repairing& Researching: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/61vcq57Mz3L.jpg)
DC Bench Power Supply Adjustable 30V /10A, 3-Digital Switching Regulated Lab Mini Power Supply Single-Output 110V, with Alligator Leads, for DIY Electronics Testing, Repairing& Researching: Amazon.com: Industrial & Scientific
![High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own | Analog Devices High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own | Analog Devices](https://www.analog.com/-/media/analog/en/landing-pages/technical-articles/high-performance-portable-dc-bench-power-supply/figure2.png?la=en&imgver=5)