On Tue, 01 Feb 2011 23:16:43 +0000, Nigel Gunn G8IFF/W8IFF wrote: >You don't make one, you go buy it. >It's just a 1:1 mains in/mains out power transformer. >You probably need something rated for a couple of KVA. They're not cheap.
It's actually easy to build an isolation transformer - IF you can find a couple of big tranformers of identical ratings. Filament transformers for huge tubes would be good, a pair of "pole pigs" would be the extreme. Connect them back-to-back, with the secondary of the first transformer feeding the secondary of the second one, and take output off the primary of the second. You lose a bit of efficiency, but it works. The other way would be to use a split primary 120/240 transformer, feed one of the 120V primaries and take output from the other. The transformer would only be capable of half it's rated power in this configuration, but with a big enough transformer you could power just about any rig. 73 -Jim -- Ham Radio NU0C Lincoln, Nebraska, U.S.S.A. TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A, HyGain 3750, IBM PS/2 - all vintage, all the time! "Give a man a URL, and he will learn for an hour; teach him to Google, and he will learn for a lifetime." HyGain 3750 User's Group - http://groups.yahoo.com/group/HyGain_3750/ http://incolor.inetnebr.com/jshorney http://www.nebraskaghosts.org _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
