# VCO 3340 Sine wave **URL:** \ **Category:** DIY STUFF\ **Created:** [June 29, 2020, 10:52pm UTC](https://lookmumnocomputer.discourse.group/t/vco-3340-sine-wave/1337 "2020-06-29T22:52:03Z")\ **Posts on this page:** 1\ **Showing post:** 34
**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:** [April 16, 2021, 10:06pm UTC](https://lookmumnocomputer.discourse.group/t/vco-3340-sine-wave/1337/34 "2021-04-16T22:06:08Z")
Looks very much like the problem discussed here > [@Debugging my Tri-Sine waveshaper](https://lookmumnocomputer.discourse.group/t/debugging-my-tri-sine-waveshaper/2877): > > Hey guys, I just breadboarded the Thomas Henry waveshaper and hooked it up to the (buffered) triangle output of my AS3340 vco but no matter what I do, I can’t get a proper sine out of it. Instead I get only the first half of the wave and the second part is flipped over, like so: Here is the schematic of the waveshaper I’m attempting to build: Some notable differences are that I’m using 12V rails and that the triangle wave out of the VCO is not 10V p/p but rat… where it appeared the problem is that the triangle wave had a DC offset; it needs to be centered on 0 V. --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/vco-3340-sine-wave/1337)._