From: utzoo!decvax!harpo!npoiv!alice!rabbit!ark
Newsgroups: net.aviation
Title: Sigtronics intercom
Article-I.D.: rabbit.607
Posted: Fri Jul 16 10:49:27 1982
Received: Sat Jul 17 01:57:13 1982

If you want to equip a Sigtronics intercom with a self-contained battery,
the easiest way is to buy a female cigarette-lighter plug at an
automotive parts store and wire it up to a battery.  You will want
something like two 6V lantern batteries in series.  No battery that
fits inside the Sigtronics case is likely to be useful, because
the intercom's current drain will exhaust the batteries in short order.