At 09:32 PM 5/28/2011, Rocket J Squirrel wrote:
>Yeah but what does it use for a frequency reference?

Never taken one apart to see.  Could be a self-contained crystal
oscillator with a frequency divider or a multivibrator  or an r-c
oscillator with a ceramic resonator and freq. divider.  I'd give some
odds it's a 555 timer though, it's low frequency and not
critical.  OTOH they use a 4 MHz crystal in the dash clock instead of
32768 Hz (which is why it's accurate to better than five seconds a
month); so maybe they got anal with the idle stab as well.

Yrs,
d