# Simple but good dual vca **URL:** \ **Category:** DIY STUFF\ **Created:** [April 18, 2020, 11:48pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662 "2020-04-18T23:48:07Z")\ **Posts on this page:** 20\ **Page:** 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:** [April 10, 2021, 11:45am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/21 "2021-04-10T11:45:50Z")
> [@fredrik](#): > > ordering a bunch of 3080s off eBay Ok, the first batch arrived today (faster than expected), and my first impression is that they’re recycled. But I can live with that. Now I’m just waiting for the PCBs to show up… ---
**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:** [April 12, 2021, 1:52pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/22 "2021-04-12T13:52:51Z")
Ok, got the second eBay batch today, and it looks a lot less recycled. Maybe they pulled them from sockets this time 🙂 (now I just have to figure out which seller sent me what package…) ---
**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 12, 2021, 2:20pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/23 "2021-04-12T14:20:37Z")
> [@fredrik](#): > > (now I just have to figure out which seller sent me what package…) There are some things Man was not meant to know ---
**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:** [April 25, 2021, 2:27pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/24 "2021-04-25T14:27:50Z")
Work in progress… ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/5/57e559e7aefd60c746e52953b3ed93d720333d77.jpeg) ---
**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:** [April 26, 2021, 10:02pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/25 "2021-04-26T22:02:36Z")
Ready for testing. ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/a/a530e2e35ee147711133f07ab2513b776c96a14b.jpeg) ---
**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:** [August 7, 2021, 3:37pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/26 "2021-08-07T15:37:09Z")
Single board stripboard by @Dud here: > [@My build progress](https://lookmumnocomputer.discourse.group/t/my-build-progress/345/3613): > > Today i’ve made half on a Dual AD/AR. And like in all my cases i need one or two VCAs, i had build maybe 5 from Niklas Rönnberg with CA3080, i like it, but each time it was a little borring to convert his version (in 2 part and with the pot on the board) so i prepared a stripboard layout ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [August 7, 2021, 3:46pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/27 "2021-08-07T15:46:11Z")
but not yet tested 🙂 > [@fredrik](#): > > Ready for testing. have you tested yours ? ---
**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:** [August 7, 2021, 5:55pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/28 "2021-08-07T17:55:03Z")
> [@Dud](#): > > have you tested yours ? I did some smoke tests IIRC but don’t recall if I did any more functional testing (my build discipline isn’t what [it’s supposed to be](https://lookmumnocomputer.discourse.group/t/how-s-everybody-holding-up/402/830) 😕) ---
**Author:** ![JaggedNZ](https://avatars.discourse-cdn.com/v4/letter/j/aeb1de/32.png) [@JaggedNZ](https://lookmumnocomputer.discourse.group/u/JaggedNZ)\ **Post date:** [August 9, 2021, 3:21am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/29 "2021-08-09T03:21:36Z")
What’s that power supply module? ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [August 9, 2021, 8:37am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/30 "2021-08-09T08:37:13Z")
An USB plug ? btw i havn’t seen the title 🤣 ![Sans titre](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/b/b/bb374123ceabebf7536e15551be886138ede7b7b.jpeg) ---
**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:** [August 9, 2021, 8:59am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/31 "2021-08-09T08:59:47Z")
It’s an industry standard SIP DC/DC converter. Nice for testing, since they’re well protected against shorts/overload. IIRC the one in the picture is a [MEAN WELL DPAN02E-12](https://www.meanwell.com/webapp/product/search.aspx?prod=DPAN02) but they’re available from a bunch of manufacturers, and for different input voltages (5 V USB in this case) and power requirements. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [August 16, 2021, 1:53pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/32 "2021-08-16T13:53:26Z")
I edited my stripboard layout I saw that i wrote 100k for all pot 🙄 it’s allways not yet tested but it’s now the good values for pots 🙂 I still have 2 of these modules to build, maybe tomorrow … ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [September 23, 2021, 3:57pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/33 "2021-09-23T15:57:31Z")
@fredrik , i have a question about this build What does means the note on the build info on N Ronnberg site, about the red square “Note the red square which indicates that you need to bend that connection.” i allways connect it in pin 9 (like all others connections between the “2 board”) also do you know what exactely adjust the trimpot please thx ---
**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:** [September 23, 2021, 6:41pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/34 "2021-09-23T18:41:11Z")
Isn’t the red square comment just pointing out that the connections are not aligned, so if you use a header you need to bend it one step: ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/7/0/70f4e3a307d77bde2b2dfef42a08c48f59dbe7ff.jpeg) The 100k trimpot adjusts the input offset. Set it somewhere in the middle (no offset) if you don’t have a reason to put it somewhere else. ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [September 23, 2021, 9:58pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/35 "2021-09-23T21:58:28Z")
Thank you 👍 (more ch…) ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [October 11, 2021, 8:34am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/36 "2021-10-11T08:34:44Z")
When testing my 2 new VCAs, they don’t react like the others I had done in the past. I check my old one, and i see that i put 4 x 560K resistors (2 instead of the 2 cap optional 33pf). ![Sans titre](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/4/1/41890d586aa8ce8a40c8e7ab89303901806ff7e7.jpeg) on my old build, with the Initial level pot i can have all the input signal without “cv fx”, even if the cv level is on. on my new one that increase the initial level, but with allways the “cv fx”. both are different and interresting, and i keep that like this. an interesting error in fact btw i need to change it on my stripboard layout to make it like the original schem 🙂 ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [October 19, 2021, 4:28pm UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/37 "2021-10-19T16:28:59Z")
Well another Dual VCA, the 5th and another coming soon 🙂 which allowed me to check my stripboard layout, which is good ! ![12 - dual vca - sound bender (1)](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/5/8/58cdcc7a71c7b50646dd43fe27653710a4ab6628.jpeg) ![12 - dual vca - sound bender (2)](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/a/dae72ac22953499fa662923e5727f6b7707a76b5.jpeg) i add this for the indicator led (to have an indication mix from CV 1 & 2 ![vca indicator led - sound bender](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/1/e/1e97732bbdeeccd4181c2d7104f9bc36848b3309.jpeg) A little patch with it [![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/3/6/36696d65e86992118c67fc58aada86d8d4174ba1.jpeg "MODULAR SYNTH DIY - DUAL VCA") ](https://www.youtube.com/watch?v=vt_sb3ZDrMo) And the VERIFIED stripboard here > [@Verified Stripboard Layouts!](https://lookmumnocomputer.discourse.group/t/verified-stripboard-layouts/81/390): > > Niklas Rönneberg Dual VCA (with CA3080) photos and vid here ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [November 5, 2021, 9:39am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/38 "2021-11-05T09:39:53Z")
No it’s not the same pics that is just above 🤣 (you can play to find difference ) Another build of this module (the 6th) ![22 - dual vca - sound bender (1)](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/a/d/add02036968cfafda64f343b7e86c1c572d5cfc2.jpeg) ![22 - dual vca - sound bender (2)](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/b/b/bb70ba0d9d204b8eded58203aba2610ba0ebe1c3.jpeg) and a little patch [![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/9/8/980e4124f27ca94c495a986096c6170d09067007.jpeg "MODULAR SYNTH DIY - DUAL VCA") ](https://www.youtube.com/watch?v=GBMbYZZHYbk) ---
**Author:** ![Dave](https://avatars.discourse-cdn.com/v4/letter/d/ee7513/32.png) [@Dave](https://lookmumnocomputer.discourse.group/u/Dave)\ **Post date:** [November 5, 2021, 10:44am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/39 "2021-11-05T10:44:38Z")
> [@Dud](#): > > (you can play to find difference ) I had to stop playing this game, as my hand was hurting from scrolling up and down the tread too many times, but I do have an answer!!! The lower standoff is in a different location? ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [November 5, 2021, 10:49am UTC](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662/40 "2021-11-05T10:49:20Z")
😁 Yes !!! 🏅 but i think there is a more big evidence … 🧐 [Previous page](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662.md?page=1) [Next page](https://lookmumnocomputer.discourse.group/t/simple-but-good-dual-vca/662.md?page=3)