18 May
2009
18 May
'09
10:07 p.m.
Chuck Guzis wrote:
On 18 May 2009 at 16:17, Dave McGuire wrote:
And was constructed in the days before we could do SPICE simulation.
Gosh!! ;-)
(Sorry, Could Not Resist, being from the OLD school, where we simulated
using Veroboard - Now the local electronics magazine is shirty if I
provide a design that uses Veroboard as "Our readers don't like
Veroboard" ----- Bugga! )
Doug
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