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What is the easiest way to make 1v/oct VCO?
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Pixelator



Joined: Oct 24, 2018
Posts: 1
Location: Poland

PostPosted: Wed Oct 24, 2018 11:53 am    Post subject:  What is the easiest way to make 1v/oct VCO?
Subject description: This will be one of my first projects
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This will be my first serious project and I need tips and schematics
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Blue Hell
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Joined: Apr 03, 2004
Posts: 22812
Location: The Netherlands, Enschede
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PostPosted: Wed Oct 24, 2018 11:58 am    Post subject: Reply with quote  Mark this post and the followings unread

welcome

There may be some good ideas on the wiki here ... http://electro-music.com/wiki/pmwiki.php?n=Main.HomePage&action=search&q=vco

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steved



Joined: Oct 07, 2015
Posts: 18
Location: usa

PostPosted: Fri Oct 26, 2018 5:44 am    Post subject: Reply with quote  Mark this post and the followings unread

this may be helpful if you are using single supply power:

https://hackaday.com/2015/09/11/logic-noise-playing-in-tune-with-an-exponential-vco/

i started with these 2: (both use bipolar power supply)
http://electro-music.com/forum/topic-28799.html

https://www.schmitzbits.de/vco4069.html

good luck !
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cslammy



Joined: Apr 27, 2018
Posts: 133
Location: USA

PostPosted: Wed Oct 31, 2018 1:16 pm    Post subject: Re: What is the easiest way to make 1v/oct VCO?
Subject description: This will be one of my first projects
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Pixelator wrote:
This will be my first serious project and I need tips and schematics



Hi Pixelator:

Some options:

I have looked around a lot and as far as I can tell if you need 8+ octaves of v/oct tracking without using a dedicated chip, the easiest option remains the ASM VCO.

I have built this now 3 times, I have a new layout on my site, a couple of users are trying out the new fab so i can't vouch for that yet.

I can let you know how that goes.

http://www.charlielamm.com/gear/VCO/forums.html#2002VCO

Pretty sure Elby designs can sell you a PCB or kit? I recall they took over the ASM project.

Also if you want to go single chip Cool Audio sells a reboot of the old Curtis VCO chip. Not sure if that's less parts, but you don't need some of the matched trannies and whatnot. Here are some schematics that use it, I've never tested any of these but I'll bet others on the forum can weigh in.

https://electricdruid.net/cem3340-vco-voltage-controlled-oscillator-designs/

There is also a "LookMum" video on youtube where that guy has a series of vids about building a vco around this chip. No idea if any of it works but the lookMumNoComputer guys vids are always fun.

https://www.youtube.com/watch?v=4Kz8YopLTCQ

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Project_2501



Joined: Jan 31, 2018
Posts: 60
Location: Los Angeles

PostPosted: Tue Nov 06, 2018 2:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

https://www.lookmumnocomputer.com/projects/#/cem-3340-diy-simple/

AS3340 are roughly $10 shipped on ebay. cheap version of the cem3340, synthcube has Original curtis chips for $15

Easy build, sam makes great stuff.

I'm building this next week, I'll post notes and samples when I complete it.
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cslammy



Joined: Apr 27, 2018
Posts: 133
Location: USA

PostPosted: Wed Nov 07, 2018 8:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Great, please let us know how this works!

I have some 3340's that need to be used for something, and LookMum always has great respect for low parts count. you got to just love the sam lookmum guy. He's funny and super enthusiastic, the really impressive thing is that he gets like 70K+ views for vids that involve DIY audio--wait, that's what we do! I didn't think it possible!!

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