# Circle Drone Of Doom Used as Upgrade **URL:** \ **Category:** DIY STUFF\ **Created:** [June 6, 2022, 7:47pm UTC](https://lookmumnocomputer.discourse.group/t/circle-drone-of-doom-used-as-upgrade/5125 "2022-06-06T19:47:45Z")\ **Posts on this page:** 1\ **Showing post:** 2
**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:** [June 6, 2022, 8:49pm UTC](https://lookmumnocomputer.discourse.group/t/circle-drone-of-doom-used-as-upgrade/5125/2 "2022-06-06T20:49:47Z")
> [@Adding CV to existing circuits](https://lookmumnocomputer.discourse.group/t/adding-cv-to-existing-circuits/1305/2): > > Matthew Skala goes over some options here: The CDoD uses transistor avalanche oscillators. These can be given a sort of quick and dirty form of voltage control as in the [2000 MEGADRONE 10 OSCILLATOR](https://www.lookmumnocomputer.com/projects#/2000-megadrone). This wouldn’t be accurate 1 V/oct CV though. You can also make an avalanche oscillator with a more sophisticated CV, see here: > **[Avalance VCO](https://kassu2000.blogspot.com/2018/07/avalance-vco.html)** > > Thanks to Look Mum No Computer , a super simple oscillator circuit has been popular lately based on the reverse avalance breakdown effect in... But that is a very substantial addition to the circuit. Really, if you want a multi-oscillator drone you can control in a kind of rough way with the M-32 CV, building the 2000 Megadrone would probably be easier than trying to mod the CDoD, and if you want to add oscillators that can play accurately in tune with one another, then it’s best to start looking at the 1222 Performance VCO or other VCOs you can find out there. --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/circle-drone-of-doom-used-as-upgrade/5125)._