# Lm13700 voltage control

**URL:** <https://lookmumnocomputer.discourse.group/t/lm13700-voltage-control/6504>\
**Category:** DIY STUFF\
**Created:** [September 1, 2023, 11:19pm UTC](https://lookmumnocomputer.discourse.group/t/lm13700-voltage-control/6504 "2023-09-01T23:19:38Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\
**Post date:** [September 1, 2023, 11:45pm UTC](https://lookmumnocomputer.discourse.group/t/lm13700-voltage-control/6504/2 "2023-09-01T23:45:59Z")

</div>

For a voltage controlled filter using LM13700 you can look at the [LMNC Performance Filter](https://lookmumnocomputer.discourse.group/t/1113-performance-filter/14) and the [MS-20 filter clone](https://www.schmitzbits.de/ms20.html) by René Schmitz that it’s based on. Though looking at it recently I think it really needs some values modified to use with modern synth levels — otherwise as people who’ve used it will tell you, you need to attenuate your input to avoid distortion. You might also be a fan or not a fan of the (deliberately) distorting resonance. If not you could try cleaning up the resonance feedback by removing the diodes and modifying resistor values. The [Barton Sallen-Key filter](https://www.bartonmusicalcircuits.com/skvcf/index.html) is a similar design, though with I think more appropriate voltage division on the input.

---

_[View the full topic](https://lookmumnocomputer.discourse.group/t/lm13700-voltage-control/6504)._