smurfer77
Super Member
Here is the post where the Poster used two halogen lamps in series with the PS to help protect the V-fets .
he then only installed one pair at a time as not to destroy all v-fets if something was wrong.
http://www.diyaudio.com/forums/soli...a-v4810-solid-state-heaven-2.html#post1918056
And here on audio karma which I'll post here:
I highlighted the part in the post about one pair at a time in RED
nacho
Nice link. Only thing that worries me is that PTC limiters are usually relatively slow (compared to the time it takes to damage a transistor) since they need to heat up before the resistance goes up, right? (but I'm more familiar with conventional PTC limters, rather than gas lamps). Another idea (I had suggested to me) was to temporarily replace the slow fuses in the power supply with quick-acting fuses of amperage just big enough rating to survive switch on, so maybe they will blow quickly if the FETs are full open.