Michael A. Terrell wrote:

azotic wrote:

(AP) WASHINGTON (AP) - A yearlong experiment with the nation's electric grid
could mess up traffic lights, security systems and some computers - and make
plug-in clocks and appliances like programmable coffeemakers run up to 20
minutes fast.


All the traffic light controllers I've seen are microprocessor
controlled, and use a crystal for their reference. Does "Cars won't

There's still lots of electronics-less units here in Chicago. It's
impressive they last years and years just slamming contacts back and
forth, all run from a timing motor.

What is the poing of the frequency variation in the first place? it's
never explained in the links.