Amrel's Clunky LPS-301 Gets a Serious UX Upgrade — Thanks to a Keypad-Emulating Rotary Encoder
Pseudonymous maker "ogdento" grew tired of the somewhat clunky six-button interface of their Amrel LPS-301 power supply — so decided to upgrade it with a shiny new push-button rotary encoder instead.
"The Amrel LPS-301 supply is a programmable 30V/2A unit that has a front-panel keypad and an isolated serial interface for computer control," ogdento explains. "The six-keys on the keypad set voltage/current values and enable/disable the output… and I don't love it. It really needs a knob! The LCD on my unit was bad so while I had it all apart to replace the display I figured I'd try to improve the controls. Incidentally, it looks like this front panel — and the mainboard inside it — is used for the other power supplies in the same product family. Amrel also made a dual channel supply and a supply with a fixed 5-volt output that share many parts."
While there's...
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