[Amps] Transistor Bias

Gene Bigham jbigham2 at kc.rr.com
Fri Oct 17 17:26:32 EDT 2003


I have been looking at various bias supplies for the 2sc2879 transistor.
I am going to run 4 of them in my amp.  An appealingly simple diagram shows a 7808 (8v @ 1 amp) regulator supplying bias for a pair of these transistors.  Anyone with any experience with this sort of set up?  I could easily put two 7808's in my circuit to feed the center tap of the input transformer to each pair of 2sc2879s.  The circuit I am looking at has an output resistor on the 7808 of 8.2 ohms and a choke in series to the center tap, and also two resistors shunting one rated 1 ohm the other labeled TBD (is that to be defined?)  This is on a Telstar Electronics schematic for what is identified as a Skywave 2879AB.
Any comments about this arrangement?
Thanks
Gene Bigham KB0GU


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