hahaha good responses steve and Mitchekj
but in all seriousness, raymondht, we need a bit more info from you of the circuit involved
If for example the cct in question was being supplied via a 7806 voltage regulator, the
input to the regulator is likely to be ~ 10 - 12V and yes with a couple of resistors
you can jack up the output of the regulator a bit ( up to a couple of volts or so)
is being supplied from say a 6V battery then not much you could do and still keep the
current ratings.
There are voltage multiplier ccts, and I have used voltage doublers, but current supplied
is the big sacrifice
cheers
Dave
VK2TDN