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Post by samuraipizzacat29 on Feb 4, 2014 0:58:35 GMT 1
Is there an oscillator module out there with Pulse width and Phase offset controls? The included oscillator works fine - except it's AC and pulse width affects both the positive and negative going sides of the wave. I need it only positive. Besides, the transients in the included oscillator are, well, yucky.
Ideas much appreciated.
Nate
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setronic
Synthedit regular
Posts: 293
Posts: 293
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Post by setronic on Feb 4, 2014 7:21:05 GMT 1
you can do something interesting with 'PWM repair' by DiVerSe:
it (shifts the phase?)as you change pulse width, seem to rmbr..
or: there is a way of separating polarity, with a comparator,
to send the pos/neg sides of a signal to separate destinations.
will look for.
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Post by samuraipizzacat29 on Feb 4, 2014 15:51:25 GMT 1
I don't see it on his page... the problem with the standard oscillator is it's centered around DC. That means 50% pulse width isn't truly 50% positive going. It's 50% positive going and 50% negative going. If you rectify/compare/etc you don't end up with a dc pulse that behaves like I want it  |
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Post by samuraipizzacat29 on Feb 4, 2014 22:41:22 GMT 1
Alright, so I've got a dc correct pulse wave with pulse varying full/full, nice! Now I'm trying to figure out how to offset the phase of the pulse. Does the included SE Oscillator phase mod actually work to introduce a phase offset, and the scope automatically corrects for it, or does it just not work how I want it to?
If my language isn't understandable - I want the Oscillator's "start" position to be variable within one frequency cycle.
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setronic
Synthedit regular
Posts: 293
Posts: 293
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Post by setronic on Feb 8, 2014 5:47:59 GMT 1
i think PWM Repair is in the files section of the usergroup ? i'll dig it out.. it's a demo that shows the waveform shifting across the +/- axis as the width is varied. his version is a correction. found it...let's see if this image thing works...  and there we are... 8-] (http://postimg.org/) and prefab: PWM Repair |
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