[sdiy] var. dutycycle lfos

[Scott Bernardi]

The easiest way to get a variable duty pulse is to run a triangle wave (or a
sawtooth) into one input of a comparator, and input a dc voltage into the other
input. As you vary the dc voltage between the + and - peak amplitudes of the
triangle, the comparator will output a variable width pulse. This is how pulse
width modulation is normally done. You can use an uncompensated opamp like the
uA301 or 748 as the comparator, or a real comparator chip like the LM311.

Arun Bohm wrote:

> Hi fellow designers. Does anyone have any schemos for a variable duty cycle
> LFO. I  was wondering about different controllers for sequencers and stuff.
> I found some schemos for that. I also found a sweep generator that I wanted
> to control with the LFO. What are some ideas?
> Thanks,
> Joey
> (arun_bohm at hotmail.com)
>
> _________________________________________________________________
> Chat with friends online, try MSN Messenger: http://messenger.msn.com

--
Scott Bernardi
sbernardi at attbi.com