I have a NSP-3630 power supply that has let out it's magic smoke.
The mains-fuse was blown, it smelled a little strange
(probably due to some heat generated inside). I opened
it and replaced to IRF840 MOSFETs and now it runs
fine again :lol: .
Now the question: Inside the supply is a halfbridge
of IRF840. There is one (impulse-)transformer that
controls the gates and is driven from a TL494.
Has someone a schematic showing a TL494 driving
a MOSFET halfbridge ?