[sdiy] Question about LFOs

[Magnus Danielson]

David,

David G. Dixon skrev:
> Here's a noob-ish question about LFOs.  First, some background:
> 
> I'm developing a module with four non-voltage-controlled LFOs with variable
> pulse-width saw-triangle-ramp and pulse outputs.  I've simulated both the
> Korg MS-20 modulation generator (with its two JFETs driving the integrator)
> and Ray Wilson's Multi-waveform LFO, sans sine-shaper (with its two diodes
> driving the integrator), each with a few minor modifications.  The Korg
> circuit generates (roughly) a 0 to 5V pulse and a -2.5 to +2.5 V triangle.
> The MFOS circuit generates (roughly) -5 to +5 V pulse and triangle.
> 
> My question is this:  Is there some "standard" for LFO voltage output, and
> if so, what is it?  Also, would it be desirable to be able to switch between
> -5 to +5 V and 0 to +/-5 V outputs?

I am tempted to say that the answer to this is the same as to the power 
rating of an engine in a Roys Rolls car... sufficient.

I would go for a range of -5 V to +5 V at all times. You rarely need 
more and you can easilly dampen it down with a pot to less.

The pulse going from 0 to 5V seems reasnoble, as it fits the trigger for 
S/H, ADSR, sequencers and similar...

The saw/triangle/ramp shape is soooo usefull. I use it alot.

Cheers,
Magnus