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additionalVCO for Arturia Minibrute
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kaputtpanzer



Joined: Nov 02, 2009
Posts: 84
Location: Cologne
Audio files: 4

PostPosted: Fri Aug 31, 2018 6:36 am    Post subject: additionalVCO for Arturia Minibrute
Subject description: and for Microbrute, Dark Energy, Moog Werkstatt....
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So I was trying to build a tuneable VCO based on the CD 4046 ic, that I can feed into the the external input from my Minibrute and also use as stand alone with filters and stuff. To build a linear tracking VCO with this IC is pretty easy, but to get exponential tracking was pretty challenging for me.
The outcome is now a VCO that is somehow tuneable to 1V/oct, but it only stays in tune at the higher octaves and miss the notes a bit at the lower octaves. the lowest note I got out of this VCO was a C2.
To get some more unusual sounds I added another CD 4046 build as a modulation VCO. The modulation VCO follows the first VCO in a linear manner. The modulation VCO and the main VCO are both fed into the 4046 XOR Gate. You get nice detuned ringmodulation sounds out of it.

It is okay to skip the voltage regulator and use it with 12V (but I always use regulated 9V with cmos ics somehow). If you use a power splitter cable the circuit can share the power supply with the minibrute. Change the resistors at the saw and square output, if you need a louder output signal. Diode D3 should be a Schottky.

I used the expo converter that I found on this website: https://gaje.jp/sx150/cust_tempco-e.html

I also copied the idea for the 4046 sawtooth output from Phobos: http://electro-music.com/forum/post-371907.html

Here is a little demonstration:


Please tell me when there is something wrong with this schematic Embarassed


addVCO.png
 Description:
Additional VCO.
HAS SOME ISSUES, better not use it.
 Filesize:  95.8 KB
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addVCO.png



Last edited by kaputtpanzer on Wed Sep 26, 2018 4:26 am; edited 1 time in total
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kaputtpanzer



Joined: Nov 02, 2009
Posts: 84
Location: Cologne
Audio files: 4

PostPosted: Wed Sep 26, 2018 4:23 am    Post subject: Reply with quote  Mark this post and the followings unread

... I am still working on this. The schematic above has several issues, do not use it. In the current state it is possible to play almost 6 octaves or more in tune, starting from C1. 4-5 octaves should be totally achievable, at least. I will upload the updated schematics within the next weeks. Laughing

http://electro-music.com/forum/phpbb-files/t_video5861545634984625232_123.mp4


t_video5861545634984625232.mp4
 Description:
additionalVCO acid house :)

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 Filename:  t_video5861545634984625232.mp4
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