Small Project: AC Mains Isolation Transformer from Two Broken UPSs (2/2)

Assembling all the parts in an enclosure, wiring them and final tests …
↓↓↓ Complete description, time index and links below ↓↓↓

Warning: This video involves mains AC, which can cause serious injury or death!

In part 1 I cobbled together the transformers from two broken APC Smart-UPS 750s (link below) to create an isolation transformer – and it kinda worked. Now it was time to put everything together in one of the UPSs’ enclosures.

This was mostly straight forward. Nevertheless I run into some smaller problems and a big (loud) one. Would you believe a transformer and a metal cage make an excellent loudspeaker for AC mains?

00:00 Intro – a warning and lots of parts on the bench
01:52 Second transformer – affixing it to the enclosure
07:20 Front panel – a whole lot of cutouts in ABS and metal
13:35 Wiring – reusing transformer connectors
23:53 Test – noise (!), voltage, isolation and load behavior
30:32 Noise suppression – more metal work

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