Hi: For my own use I have made prototype quantities of a power supply that uses TO-92 packaged linear voltage regulator chips. The small printed circuit board has battery snaps to go on top of a 9 volt battery, on top of a 10 AA battery holder or gets power from a wall wart with a 9 volt battery snap connection. More info at: http://www.pacificsites.com/~brooke/BTPS.shtml Both fixed voltage and variable voltage versions are available. If interested let me know. Have Fun, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com