I'd like to clarify this a bit. While the K3 does have some protection against over voltage on its supply, we do not garantee it will survive an overvoltage event in all cases.
73, Eric www.elecraft.com _..._ On Aug 20, 2010, at 1:00 PM, Scott Ellington <[email protected]> wrote: > Some power supplies, like the Samlex SEC 1235, have no built-in overvoltage > protection. All regulated power supplies are capable of producing much more > than their normal output voltage if any one of a number of things fails. > Linear supplies are particularly susceptible, since the pass transistor can > short. > > While Elecraft assures me that the K3 can survive an overvoltage with minimal > damage, I prefer to be on the safe side. So I designed a crowbar circuit, > which can be used with any 12 V power supply up to 30A. If the voltage > exceeds the trip point (14-16 V), it will short the power supply output and, > if necessary, blow a fuse. > > http://www.ssec.wisc.edu/~scotte/hr/OVP.pdf > > I haven't built this one yet, but a very similar one I built in 1984 worked > fine. > > 73, > > Scott K9MA > > Scott Ellington > Madison, Wisconsin > USA > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
