[sdiy] Adding offset to vactrol??

[John Mahoney]

At 10:26 AM 6/3/2008, Dan Snazelle wrote:

>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

I would love to know enough to help you, but I know just enough to be 
dangerous! ;-)

All I'm saying is that (a) Vactrols are slow, and (b) a VCO's output 
can be used as a control voltage.

I don't understand the part about "converting this great square wave 
to a cv". How is the output supposed to be different from the input? 
(I mean, what is supposed to happen in this conversion process?)

Careful when you say "track the pitch," that implies that you are 
trying to do a frequency-to-voltage conversion. Based on your 
previous post, I think you mean "get the vactrol to track [at audio 
frequencies]".

Good luck, sorry I'm not more help.

John


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