Bench Power Supply
It is rated for 0-12V. My kids managed to pull mine off the table and smashed the 500 ohm potentiometer. I wound up replacing it with a 1k ohm pot I had handy. I find I can get up to 15V from the supply with no problem for light loads.
I like re-using enclosures and parts from broken or old stuff. I used the case from an old coffee grinder that died.
I added the terminals, which I had on hand.
I also added the LED, switch and knob seen below.
I've bought some parts to add an LED bar graph to give me a rough idea of the output voltage, so I don't always need my multimeter to check it.