# Simple 3340 VCO CV Range **URL:** \ **Category:** DIY STUFF\ **Created:** [May 27, 2020, 2:36pm UTC](https://lookmumnocomputer.discourse.group/t/simple-3340-vco-cv-range/1030 "2020-05-27T14:36:26Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![fredrik](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/fredrik/32/682_2.png) [@fredrik](https://lookmumnocomputer.discourse.group/u/fredrik)\ **Post date:** [May 27, 2020, 2:44pm UTC](https://lookmumnocomputer.discourse.group/t/simple-3340-vco-cv-range/1030/2 "2020-05-27T14:44:11Z")
The IC input is current driven, and sums up the currents from multiple voltage sources (CV inputs, tuning knobs, octave selectors, …). As long as you stay within reason (e.g. the supply rails) you cannot really overdrive it. See [here](https://lookmumnocomputer.discourse.group/t/need-some-help-with-the-kosmo-vco-w-tuner-please-i-ve-lost-weeks/691/50) for the relation between voltage and frequency. Note that you need more than 12 V in **total** to get beyond 3100 Hz (~G7). --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/simple-3340-vco-cv-range/1030)._