"Jim Weir" wrote:
Fifteen years ago they had an avionics writer that didn't
know which end of the soldering iron got hot.
....

A classic was in Custom Planes, whose avionics writer had nothing in
his bio I found elsewhere to suggest he should be. He was explaining,
in an article entitled "Understanding Parallel Feeds," series verses
parallel wiring in a airplane, for practical reasons hard to fathom
once you thought you understood the title. He described an example of
a builder wiring two 14V radios in series in a plane with a 14V system
(who would?), but his reasons this wouldn't work -- he said both
displays would be dim -- missed the problem of the physical
installation resulting in a common ground. One will work just fine,
the other won't at all.

In another article, he explained Watt's Law to say that if your
battery voltage were to drop to 11 volts, your circuit breakers can
pop, because when voltage goes down, current must go up. So use
bigger breakers. And you'll like his explanation of how all avionics
work, I guess Circuit Design 101:

"Every piece of avionics in your plane contains thousands of [series]
circuits. They're used to modify voltages or signals between
stages...they allow your avionics to use them to drive...even moving
map displays."

Fred F.