[Elecraft] Low Battery Warning CCT?

[Martin AC6RM]

Tony;

   Here's a small low-cost kit that should fit the bill:

http://n4uautoo.home.sprynet.com/kits/Surface%20mount%20kits%20page/SMproj3.htm

   I've built two of this guy's kits (power boosters) and they work well. 
I haven't built any of his SMT stuff, but if the power boosters and his
service are anything to go by, you won't be disappointed.

   73, Martin AC6RM

- - - -

In the meantime, has anyone got any ideas on a low-cost, low component count
cct this I could look at?