[sdiy] Adding offset to vactrol??

[Dan Snazelle]

because i cant get a good control voltage!

here is the scenario. i wanted to try and get a 4024's signal to create a CV.
sadly it tried converting this great square wave to a cv using an lm2917 but it doesnt track very well.

so i was trying to find a way to get the vactrol to track the pitch.

but i guess from what you are saying this isnt possible.

but there are other situations where you CAN offest a vactrol or run it with a transistor right?

i would love to know more about how to use these things.

thanks

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> Date: Tue, 3 Jun 2008 10:10:25 -0400
> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
> From: jmahoney at gate.net
> Subject: Re: [sdiy] Adding offset to vactrol??
>
> 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
>
>
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