8 Dec
2005
8 Dec
'05
12:08 p.m.
I have never
had a chopper transistor fail open-circuit.
casualties so far are both choppers (IRF740's), the UC3844, and a couple of
resistors (they were hidden by the heatsink before; rather obviously cremated
now I've removed it!)
The UC3844's current sense line got a blast of mains down it which is what
killed it...
I'll test other components in the area though in case they've failed with no
visible effects.