18 May
2009
18 May
'09
9:04 p.m.
On 18 May 2009 at 16:17, Dave McGuire wrote:
Oh, how thoroughly bizarre. Thanks for the
explanation. I'd love
to see a SPICE simulation of that.
What's noteworthy is the stability of the thing. ISTR that DTMF
signalling relies on a tolerance of something like +/-2%. A mass-
produced LC oscillator that operates reliably close to tolerances in
a steel mill or a meat-packing plant is a marvel.
--Chuck