I've been told that DC-DC Buck or Boost converters like these: http://www.ebay.com/itm/261316095061 http://www.ebay.com/itm/261318532314 will regulate their outputs through wide input excersions at least as well as something like an LM-317 (assuming one stays within the devices design limitations). Can anyone here vouch for that? 73 D.S.