The instrument which probably the greatest number of Hackaday readers own is likely to be the humble digital multimeter. They’re cheap and useful, but they’re single-channel, and difficult to ...

The power supply on a computer transforms the alternating current from the wall outlet into a direct current flow that the computer's components can use. Testing the DC voltage output of the power ...

Last weekend, I traveled to Michigan to help run the Cure For Gingervitis 24 Hours of LeMons race, and I packed a VDO 2-1/16-inch diameter voltmeter among the socks and cameras in my luggage. I'd ...

[Martin Lorton] has a vintage Harmon 4200B selective voltmeter that needed repair. He picked it up on eBay, and he knew it wasn’t working, but it was in good ...