Quote:
Originally Posted by nasadowsk
As for a live chassis TV? these days, I'm amazed - switching power supplies are so cheap to build it's amazing.
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In a sense, half of a switching power supply is a "hot chassis" design. The line gets rectified, filtered, and there's high voltage high powered transistors being driven by an oscillator that switches current on and off into a high frequency transformer.
Any line operated device has to have some powerline wiring inside, and as long as that is well insulated via a plastic or wooden cabinet, it's not an issue. It's then an easy extension to just make the entire thing hot chassis, and if it's a self contained radio with internal antenna and speaker, and is completely surrounded by a non conductive cabinet, it is safe.