XR-VCO at +/-12V

macumbista · Posted: Fri Aug 23, 2013 11:42 am Post subject: XR-VCO at +/-12V

Is anyone running the Thomas Henry XR-VCO at +/-12V, and if so can it be done without modifications? If not, what did you mod?

macumbista · Posted: Mon Aug 26, 2013 4:23 am Post subject:

Received the following from Tom Bugs, would be happy to get feedback from anyone else running at +/-12V:

macumbista · Posted: Tue Aug 27, 2013 4:04 am Post subject:

This thread has also been useful:

http://www.electro-music.com/forum/topic-54360.html

Thomas_Henry · Posted: Tue Aug 27, 2013 11:54 am Post subject:

I get the "dead travel" comment quite a bit on all my designs. Just so you know, that design feature is intentional and based on something picked up from Bernie Hutchins of Electronotes fame decades ago. In particular, the values for the Initial and VC input resistors are carefully chosen for maximum versatility. That is, the VC input can accommodate either a +5V envelope, a bipolar 10V signal, or any other weird mixture of control signals. So, yes, if just using Initial by itself, or VC by itself, it might seem like there is dead travel. But when doing sophisticated VC summing, you will never bump in into a rail or pin the response at the extremes.

Thomas Henry