Thank you Travis and danke, Bernhard, owing to Bernhard´s hint I was able to browse a little myself and found that thread, too. Especially interesting, because I had one such 12V to AC adaptor lying around anyway. Just hooked it up and it works fine. Still, it is not the solution I favor in terms of power consumption/ battery life. The adaptor draws approx. 1A of current from the battery, (which is about accaptable for me) but could presumably be at least halved if you are able to connect the battery directly to the EDP´s circuitry. regards, Manfred Travis Hartnett wrote: >There's someone on the list (I think it's on this list...) who put >together a portable rig, described in this message : > >http://www.loopers-delight.com/LDarchive/200101/msg00254.html > > >It could be heavier and more costly than you're hoping for though.