[sdiy] CV source - just checking its as easy as it seems...

[synth at oldmail.charlielamm.com]

You can do this, but, in general, I like to buffer the sources for CV that
I use to feed my voltage controlled modules, and make sure all the inputs
are buffered as well, otherwise you may suck a lot of current out of your
power supply and/or have a rash of other problems.

Here is a good buffering circuit for distibuting the CV's--I have used 
variations of this on a number of projects and it works great.....

http://www.musicfromouterspace.com/analogsynth/cvdistributor.html

For buffering circuit inputs, you generally use a high-Z op amp and a few
resistors, or something similar, between the CV source and the part of 
your circuit that responds to control voltages....fortunately many VC 
designs you will see already have this.

Hope this helps.

--CL


On Fri, 4 Mar 2005, Julian wrote:

> My modualar power rail is +12v.
> 
> If i connect straight from this, to a resistor (to cut the voltage to 5v), and then through a, say 1M pot, to a jack socket, is this
> going to be fine?
> 
> I know that the voltage will never reach zero on the output here.  Thats ok with me, but do i have the general idea ok?
> 
> I know this is real basic, but, even though im carefull when i build other peoples boards, i really dont get much of the math....
> 
> Ohms law, right?  But all this talk of current...
> 
> Just trying to build a manual CV source for use with other modules.
> 
> Cheers, Julian
>