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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
How much current in a cv signal ?
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marr



Joined: Oct 31, 2006
Posts: 33
Location: Texas
PostPosted: Wed Jan 03, 2007 6:31 pm    Post subject: How much current in a cv signal ? Reply with quote  Mark this post and the followings unread
I want to try my hand a making a midi-cv converter. I've got the midi part under control, but cv is new to me. Is it as simple as feeding the right bits to a DAC chip and running that to the SLMS's cv input(s)?

Does the cv signal have to be bipolar? Or is everything 0V and up?

Are there favored DACs for this task in the 0V-to-10V output range?

How much current do cv signals require?

Lots of questions.. I appreciate any tips!
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blue hell
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Joined: Apr 03, 2004
Posts: 24676
Location: The Netherlands, Enschede
Audio files: 330
G2 patch files: 320
PostPosted: Wed Jan 03, 2007 7:28 pm    Post subject: Re: How much current in a cv signal ? Reply with quote  Mark this post and the followings unread
marr wrote:
I want to try my hand a making a midi-cv converter. I've got the midi part under control, but cv is new to me. Is it as simple as feeding the right bits to a DAC chip and running that to the SLMS's cv input(s)?


That's the idea yes, and for an octave jump it should output 1 V extra, equaly divided amongs the semi tones, or you could do quarter tones or any TET scale really - see : http://en.wikipedia.org/wiki/Normalizing_the_Musical_Scale
favored DACs for this task in the 0V-to-10V output range?

Are you going to use pitch bend as well ? Velocity on/off out could be fun as well.
Quote:

How much current do cv signals require?


Virtually nothing, it's like 10 V in 100 k, typically, which is like 0.1 mA, so lets say to design it for a few mA, then you could drive several inputs without a problem.
_________________
Jan
also .. could someone please turn down the thermostat a bit.
Posted Image, might have been reduced in size. Click Image to view fullscreen.
9 3 4 .. erm .. not 13 then? .. hmm, ah eight! .. yeah yeah as in 8647 .. 47 is an 88 .. pwew .. numbles!
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