[sdiy] LFO control - frequency or time?

[mark verbos]

depends if you want the control to make it faster or slower as you  
turn it clockwise.



Mark



On Jun 1, 2009, at 6:21 PM, Neil Johnson wrote:

> Hi all,
>
> Ok, here's a good point for discussion:
>
> In my latest design on the bench I have a VCLFO which so far has a  
> range of about 125us (8kHz) to roughly 120s (8mHz).  I think it  
> could go even slower, but so far I don't have the patience to sit  
> there with an hour-glass and time it.
>
> So I got to thinking: for a CONTROL oscillator is it more useful to  
> think, and program/use/set/twiddle, in terms of TIME (how long a  
> cycle takes) or use the same concept of FREQUENCY as for the audio  
> oscillators?
>
> I open the debate with the view that it should the TIME - for a  
> slowly-varying control signal I think it makes more sense to think  
> in terms of how long a modulating cycle will take.  Saying	
> 	"I want a slowly varying modulation over 54 seconds"
> seems more natural and intuitive than saying
> 	"I want a slowly varying modulation rate of 18.5mHz"
>
> Comments welcome!
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
>
>
>
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