FREQOUT Waveform

Archiver

In a message dated 5/4/2004 1:02:45 PM Eastern Daylight Time,
parkiss@e... writes:


> Has anyone looked closely at the output of the FREQOUT command? Is
> it a simple solid on for part of cycle, solid off for rest, 50% duty
> cycle waveform, or more complex?
>

It is a square wave with many little peakies when it reaches max and many
more when it starts toward 0 - not a nice clean waveform by any means. I never
really checked the duty cycle but trying to remember the last time I looked it
seemed to be about 50%. Don't worry about the waveform - the command works
really well. My robot plays "On top of ol' Smoky" while it is cruising [noparse]:)[/noparse])

Sid Weaver
256K of plugin EEPROM................
http://www.visualmuses.com/chipcircuit/index.html





[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

It's more complex. When that waveform is filtered (it's designed to
be), the output will be nice clean sine wave. It's kind of neat to see
on a 'scope, especially when you specify two frequencies -- you can
actually see one frequency riding on the other.

-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office

---

Original Message

---

From: S Parkis [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=fjkbcD4sUUCiaaVh5WeN0CG6VlG654c85XXwbCthzlN7SLbq75_p8O2ErUM8FqsKiSGsrsKa3WB-v58_Ag]parkiss@e...[/url
Sent: Tuesday, May 04, 2004 12:56 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] FREQOUT Waveform


Has anyone looked closely at the output of the FREQOUT command? Is it a
simple solid on for part of cycle, solid off for rest, 50% duty cycle
waveform, or more complex?

Thanks and regards,

Steve


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Archiver

Has anyone looked closely at the output of the FREQOUT command? Is
it a simple solid on for part of cycle, solid off for rest, 50% duty
cycle waveform, or more complex?

Thanks and regards,

Steve

Archiver

I've made a respectable sine wave by using a discrete opamp filter --
but don't expect the same kind of high quality sine wave you will
get out of a Wien Bridge/

I've thought of using the output, a phase-lock loop as a freq
multiplier and a tunable filter like the LTc1063 from Linear Tech

--- In basicstamps@yahoogroups.com, "S Parkis" <parkiss@e...> wrote:
> Has anyone looked closely at the output of the FREQOUT command? Is
> it a simple solid on for part of cycle, solid off for rest, 50%
duty
> cycle waveform, or more complex?
>
> Thanks and regards,
>
> Steve