Pete,
I've never had any reason to look at the KEY OUT circuit before, but it uses a very robust IRF1630 power MOSFET, rated at 200 volts and 10 amps. Very robust indeed, its no wonder I've never had a failure. Its not a surface mount device, its a TO220 package. 73 Frank W3LPL ----- Original Message ----- From: donov...@starpower.net To: elecraft@mailman.qth.net Sent: Saturday, December 28, 2019 4:43:05 PM Subject: Re: [Elecraft] K3 - KEY OUT problem Hi Pete, Perhaps more important: how did this unusual failure occur? Unless you can figure this out with a reasonable degree of certainty, you're radio is likely to make multiple trips for repair. One possibility is that you connected a relay to the KEY OUT connector, but the relay didn't have a snubber diode across its coil. That could cause enough of a spike to damage your radio. Another possibility is that you plugged the incorrect cable into the K3 and excess voltage on that cable damaged your radio. Good luck! 73 Frank W3LPL ----- Original Message ----- From: "N4ZR" <n...@comcast.net> To: "Elecraft List" <elecraft@mailman.qth.net> Sent: Saturday, December 28, 2019 3:57:01 PM Subject: [Elecraft] K3 - KEY OUT problem Thanks to everyone who responded. I've now written to Elecraft Support, and anticipate that it will have to go back to the mother ship. -- 73, Pete N4ZR Check out the Reverse Beacon Network at <http://reversebeacon.net>, now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to donov...@starpower.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
