July 21st 03, 07:55 AM
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On 20 Jul 2003 23:28:34 GMT, (Avery Fineman)
wrote:
In article , Paul Burridge
writes:
On Sat, 19 Jul 2003 17:39:23 GMT, John Popelish
wrote:
Paul Burridge wrote:
Feed the square output to a coil+capacitor in parallel and you'll get
a sine wave. Tune the this 'tank' circuit for harmonics of the
funamental and you can double, triple, quadruple and so on the
original square wave's frequency.
This works pretty good at the third and fifth harmonics, but there is
no second or fourth harmonic in a perfect square wave.
Good point, John. But fortunately, I've never generated a *perfect*
square wave! :-) In practice, it's probably more accurate to say that
the even harmonics are well down on the odds. Blame it on dv/dt.
Hmmm...I'd "blame" M. Fourier for any of that, not the "dv/dt."
Sorry. The reference to the dv/dt was supposed to appear directly
after the quip about the "perfect square wave" - rather than blaming
Fourier, perhaps my text editing should be held culpable. :-)
Anyway, Len, by all means send me a copy of your program. All these
little utilities will doubtless prove their value at some future time.
Thanks.
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