Diode. Dan
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Monday, December 12, 2005 8:59 PM To: [EMAIL PROTECTED]; [email protected] Subject: Re: [Elecraft] Power Supply Question Hi Fred, Your PSU has probably suffered the same fate as our local 70cm repeater PSU did when we floated a battery across the output for emergencies. When the PSU was switched off it blew the DC fuse on the output of the PSU. The reason is the battery is capable of feeding enough power back into the PSU to exceed the current rating and rupture the output fuse which normally protects the PSU. The solution in our case was to fit a relay on the PSU DC output with it's coil powered from the AC supply. When the AC supply fails, the DC output link is cut off from the PSU. Not all PSU suffer this problem as we never had a problem with the 2m repeater with floating a large gel cell across that, but yours apparently did! Regards, Bob, G3VVT _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
