Hello. I am currently researching psu design and am now onto short circuit protection. I have been looking at the foldback and am wondering what I would have to search for on google to get info/tutorials on trip switches set off by a foldback. I figure that instead of connecting emitter to Vout it would be much better to have some sort of set up where the emitter connects to a shut off circuit, maybe a trip or a shut off with a timer with led and buzzer to tell you when its not happy on overload. What is such a circuit called please? it may be a dumb question. I am looking for tutorials so I may learn principles of shut down devices and trip switches so a point in the right direction would be really helpful please. Thank you