[sdiy] Adding offset to vactrol??

[John Mahoney]

At 07:48 AM 6/3/2008, Dan Snazelle wrote:

>I have been playing around with vactrols. VTLC53's and clm6000's. I 
>would like to use them with CV sources. I would like to be able to 
>add some offset of some kind so that i can get around 2 issues:
>
>1. they dont start reacting until a certain voltage ( is it 2 
>volts?)-is there a way around this?
>
>2. they stop reacting when being driven by a high frequency from a 
>vco or lfo. (not that high a frequency either. the led just STAYS 
>on. for example is there a way to add an offset so that the vactrol 
>thinks 1khz is actually 350 hz -this is just an example but i'd love 
>to be able to actually have the vactrol send out a cv that can 
>follow a vco from very low to very high.
>
>any help greatly appreciated!!
>
>thanks


I think you've answered the offset question, yourself.

The response times of Vactrols are pretty slow. Some have faster rise 
times with slower decays, others work the other way, and some are 
in-between, but they are all very slow by electronics standards. 
Tracking an LFO is about all that you can expect.

But wait... why do you need to run a VCO signal through a Vactrol in 
order to obtain a control voltage? The VCO's signal *is* a control voltage.

John


-- 
No virus found in this outgoing message.
Checked by AVG. 
Version: 7.5.524 / Virus Database: 269.24.6/1480 - Release Date: 6/3/2008 7:00 AM