simple LFO question

[Magnus Danielson]

From: WeAreAs1 at aol.com
Subject: Re:  Re: simple LFO question
Date: Tue, 20 Jun 2000 22:38:41 EDT

> 
> In a message dated 6/20/00 12:25:39 PM, you wrote:
> 
> <<The Hypertriangular LFO design by Anderton was based on a Curtis CEM 3340
> VCO chip -- I have the schematics;  could scan them & send them to you, but
> you'd still have to get hold of one of those hard-to-find chips.>>
> 
> The way Craig's Hypertriangle works is that it simply feeds some of the 
> triangle's output back into the LFO's CV input.  This causes the frequency of 
> the LFO to modulate faster and slower as the triangle's amplitude goes up and 
> down (or slower and faster, if you invert the CV before feeding it back.  I 
> don't remember which way Craig said sounded better for flanging...)  At any 
> rate, you could do this with any voltage-controlled LFO - you don't 
> specifically have to use a CEM3340.

Neat! Very Neat!

The positive feedback makes the peaks peakier and negative feedback
makes the triangle more sinously formed.

However, the frequency will be feedback dependent. Hmm... this
requires some analysis. Was it feedback into a Hz/V or V/oct type of
input?

Cheers,
Magnus