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

Quincas Moreira quincas at gmail.com
Wed Sep 16 17:35:40 CEST 2020


Love to read Roman waxing poetic about the summertime <3


On Wed, Sep 16, 2020 at 9:41 AM Roman Sowa <modular at go2.pl> wrote:

> The summer is what the name says. There are always other sources going
> to this summer, either externally or from internal trimming. It's not
> that the oscillator will suddenly stop if -0.1V will be applied to the
> expo CV input.
>
> Roman
>
>
> W dniu 2020-09-16 o 15:49, MTG pisze:
> > 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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-- 
[image: QMA]

Quincas Moreira
Director | QMA
mobile:  5534988825
site:  quincasmoreira.com
email:  quincas at gmail.com
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