Folks, I just added a hi-current LED to my K2 as a SPLIT/RIT/XIT indicator. Adding the emitter follower transistor was a cinch. I used a 2N2907 PNP transistor, connected the base where the cathode of the lo-cur LED would have been, connected the collector where the anode of the lo-cur LED was to be connected and connected the hi-current LED between the emitter and ground. It worked FB and was plenty bright.
73, Don W3FPR > -----Original Message----- > > Hi Rick: > > IF you attempt this (though I suspect you're kidding), be aware that the > LED specified for the SPLIT/RIT indicator is a Hi-Eff (e.g. very low > current) device. If you (or anyone else) use a regular LED, you will have > to add a driver transistor in order to allow the LED to draw more > current. > The Hi-Eff LED only draws 2 mA of current in the present circuit design. > > Have fun, kidding or not. > > Tom N0SS > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.9/118 - Release Date: 10/3/2005 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
