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What Voltages actually are CV Signals
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Author What Voltages actually are CV Signals
allears62
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PostPosted: Tue Sep 23, 2014 3:36 am    Post subject: What Voltages actually are CV Signals Reply with quote Add User to Ignore List

Hi, I'm considering getting into expanding my modular using either an arduino or a raspberry pi (purely cause I already own one) using the GPIO. But I was wondering and can't find a simple explanation anywhere, what is the actual range of control voltage? (I use eurorack is that makes any difference!)
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loopt
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PostPosted: Tue Sep 23, 2014 3:40 am    Post subject: Reply with quote Add User to Ignore List

This page on the Doepfer website explains everything.
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allears62
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PostPosted: Tue Sep 23, 2014 3:44 am    Post subject: Reply with quote Add User to Ignore List

Awesome cheers! I hadn't found that one, so the 0-5v I can produce from the Pi would make and ok CV then?
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Rumblin_Cynth_Rampo
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PostPosted: Tue Sep 23, 2014 4:38 am    Post subject: Reply with quote Add User to Ignore List

I'm not sure if you realise but you may only be able to output 0v or 5V from your Arduino GPIOs, not sure about the Raspberry PI as I havent played with one. CV voltages are variable so you may have to add some extra circuitry to get voltages between 0v and +5V (e.g. some sort of filtering to shape PWM or feeding multiple ports to a DAC which while easy isnt really a good use of the i/o ports )

Have a look at Electric Druid's website he has some info on using micro-contollers to generate wavefroms and CVs (OK he is using a PIC but the theory is the same)

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daverj
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PostPosted: Tue Sep 23, 2014 12:29 pm    Post subject: Reply with quote Add User to Ignore List

Euro uses various ranges of voltages for different functions. -5v to +5v is the general analog control and signal range for most modules. Digital signals, like gates and triggers, may be 0 to +5v, 0 to +7v or 0 to +10v, depending on who made the module.

To get an analog voltage you need to either use a D to A (D-A) converter, or use a GPIO pulse that is pulse-width modulated into a filter or integrator. GPIO signals by themselves tend to be simple on/off (0 to +5v) type of signals with no analog range between. You can still use them directly as CV voltages. But they only have two states: high and low.

EDIT: oops, I wrote A-D instead of D-A. now fixed.

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Last edited by daverj on Wed Sep 24, 2014 11:29 am; edited 1 time in total
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Nantonos
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PostPosted: Tue Sep 23, 2014 3:34 pm    Post subject: Reply with quote Add User to Ignore List

daverj wrote:

To get an analog voltage you need to either use an A to D (A-D) converter,


obvious typo but just too be clear; a D to A (digital to analog converter, DAC). Here is an explanation of DACs for the RPi.

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sempervirent
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PostPosted: Tue Sep 23, 2014 3:42 pm    Post subject: Reply with quote Add User to Ignore List

All of them?
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PhineasFreak
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PostPosted: Wed Sep 24, 2014 5:13 am    Post subject: Reply with quote Add User to Ignore List

although you can find the eurorack 'standards' as per the link on doepfer's page earlier in the thread, it's worth condisering that to make a module fit to the true spirit of modular synths it's nice to have all signals totally interchangeable and cross compatible whether 'cv' or 'audio' - i.e. allow the module to be miodulated by vcos in the cv in's and be dc coupled so it can process cv signals through the audio path.

sometimes this may only be achievable by offsets, attenuators, attenuverters or multipole sockets with different range, normalling an other functions, but it';s nice to be able to connect any module in any way ytou can imagine where possible.

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daverj
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PostPosted: Wed Sep 24, 2014 11:30 am    Post subject: Reply with quote Add User to Ignore List

Nantonos wrote:
daverj wrote:

To get an analog voltage you need to either use an A to D (A-D) converter,


obvious typo but just too be clear; a D to A (digital to analog converter, DAC). Here is an explanation of DACs for the RPi.


Oops. Typing faster than thinking. I fixed the post.

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paperCUT
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PostPosted: Wed Sep 24, 2014 11:54 am    Post subject: Reply with quote Add User to Ignore List

PhineasFreak wrote:
although you can find the eurorack 'standards' as per the link on doepfer's page earlier in the thread, it's worth condisering that to make a module fit to the true spirit of modular synths it's nice to have all signals totally interchangeable and cross compatible whether 'cv' or 'audio' - i.e. allow the module to be miodulated by vcos in the cv in's and be dc coupled so it can process cv signals through the audio path.

sometimes this may only be achievable by offsets, attenuators, attenuverters or multipole sockets with different range, normalling an other functions, but it';s nice to be able to connect any module in any way ytou can imagine where possible.


Exactly. Audio and CV mean the same thing in modular world. Digital and analog the same.

Anywhere from -12v to +12v, 0Hz to 1,000,000kHz is the standard.

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