Well, I've been doing some thinking... dangerous , I know...
Anyway... I'm going to start with the phantom power supply first. Since a very clean phantom power supply is very useful on it's one...
I'm thinking that (5) of the 9 v DC (actually 9.6 v nominal) NiMH batteries would work well to supply the phantom power and the juice the active part of the circuit will require. The problem is... If I wire them all together in series... how to charge them correctly... I'm waiting from a response from Thomas Dist. as they sell the batteries I am looking to use.
BTW, using the 9v NiMH batteries is about 50% less expensive than buying the eight 6 v cells Doug uses in the M148. They don't have the storage capacity (about half) but they can be cycled more times and are smaller and lighter in the end. I'll post again when I get the charger circuit figured out...