Build a Dummy Load to test vintage power supplies

About this video

A resistive dummy load built from power resistors or car light bulbs lets a vintage computer power supply be tested. The video also works through choosing values and a reference sheet.

Good to know: Mains voltage inside, and capacitors that stay charged after unplugging. The loads run hot.

Why watch it

Gives a way to check a vintage supply under load before any machine is connected. The maker adds basic electrical theory so that part values can be worked out, which is the part to take in first.