[sdiy] CV outputs from 3.3V and 5V uC systems

MTG grant at musictechnologiesgroup.com
Wed Sep 16 15:49:38 CEST 2020


Pitchbend is what I was curious about. Is it safe to send a negative 
voltage to a (summer) in another module? I don't have experience with 
this, but if a CV (elsewhere) needs to be only "bent down" using this 
module, how is it done?

GB

On 9/16/2020 6:04 AM, Roman Sowa wrote:
> Hello Spiros and list,
> first of all, you don't just put "any off the shelf DAC" in a decent 
> MIDI2CV converter. If you want 10 octave range then too low power 
> supply is the least of your challenges.
>
> my advice is:
> 1. yes, this is the best way. Do nothing and have 5 octaves (or more 
> like 4.5) with some usability
> 2. if you really want to go that way, there are full-contained power 
> boosters, even making +/-15V out of 5V, in a form of small SIP device, 
> or even SMD chip. Just add some additional filtering and you're done. 
> It will have noisy output, but it's so easy to have whatever voltage 
> converter nowdays.
> 3. negative CV range is useful when someone wildly twists pitchbender 
> at the lowest note. But -3V seems like overkill. OTOH who told you it 
> cannot be -10V to +10V. Everything has its uses, pitch CV is just one 
> example. In fact you could make it switchable like +/-10, +/-5, 0..5, 
> 0..10, -5..10, -10..10 etc.
>
> You don't need 100mA for that. If you think you do, search for another 
> parts. I'd say more like 10mA is your goal.
>
> Roman
>
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