On Thu, 14 Sep 2017 08:48:14 +0100, Chris Green wrote:

====snip====

Cordless tool manufacturers don't seem to have (yet) discovered the
cheap 'buck' converters you can get to step up (as well as down) DC
voltages. I use these extensively on my boat (12 volt system, like a
car) to provide efficient supplies for running several 9 volt devices
like routers and switches (that's networking stuff, not woodworking)

I'm not sure whether you're referring to the fact that pretty well all
such IT kit utilises buck converters to provide the internal 5 and or 3.3
volt rails from their supplied wallwarts and as such can be powered off
any DC voltage from 6 to 15 volts (or even as high as 25 volts in some
cases) regardless of their nominated DC input voltage ratings in the 7.5
to 15 volt range, including 12 volts, on condition that the substitute PSU
can supply the required volt amps, or whether you're simply stating that
you use a 9v buck converter powered by the 12 volt supply to power your
collection of 9 volt IT kit. Hopefully, it's the former rather than the
latter interpretation. :-)

--
Johnny B Good