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

[Quincas Moreira]

Tom, if I understand correctly, this will be a standalone device which
probably doesn't already have bipolar 12v rails.

On Wed, Sep 16, 2020 at 6:01 AM Tom Wiltshire <tom at electricdruid.net> wrote:

> Why not just use an op-amp on the +/-12V rails to increase the output from
> the DAC from 3.3V or 5V or whatever you have? It’s only a little bit of
> gain you need. Of course, the steps between DAC values increase too, but
> that’s just a question of having enough resolution, which you’d need to do
> anyway, even with a higher voltage DAC.
>
> Messing around with power supplies is overcomplicating it, it seems to me.
>
> Tom
>
> ==================
>       Electric Druid
> Synth & Stompbox DIY
> ==================
>
>
> > On 16 Sep 2020, at 10:29, Spiros Makris <spirosmakris92 at gmail.com>
> wrote:
> >
> > Hello list,
> > I am working on a (predominantly) midi project, based around the Teensy
> platform, and I'm trying to figure out the best way of adding a CV output,
> compatible (and useful) with eurorack.
> > Without any additions, I can use any off the shelf DAC to get 4 or 5
> octaves of 1V/oct, but I would be interested in supporting the whole MIDI
> range (~10 octaves) - which means I need some switching converters, perhaps
> even a voltage inverter.
> > The options I can think of are:
> > 1. Don't do anything, have 5 octaves of range.
> > 2. Use a boost converter to get a 12V rail, then have 0-10V range
> > 3. Use both a boost and inverting converter, to get a pair of dual
> voltage rails (-12/+12 or similar?), and use a (-3,8V) range.
> >
> > I know the basic concepts of switching converters, but have never used
> one myself. I assume I need less than 100mA of current (to supply 4 opamps
> and a DAC), what parts would you recommend?
> >
> > Regards,
> > Spiros
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>
>
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-- 
[image: QMA]

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