<div dir="ltr">Tom, if I understand correctly, this will be a standalone device which probably doesn't already have bipolar 12v rails.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 16, 2020 at 6:01 AM Tom Wiltshire <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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.<br>
<br>
Messing around with power supplies is overcomplicating it, it seems to me.<br>
<br>
Tom<br>
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> On 16 Sep 2020, at 10:29, Spiros Makris <<a href="mailto:spirosmakris92@gmail.com" target="_blank">spirosmakris92@gmail.com</a>> wrote:<br>
> <br>
> Hello list,<br>
> 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.<br>
> 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.<br>
> The options I can think of are:<br>
> 1. Don't do anything, have 5 octaves of range.<br>
> 2. Use a boost converter to get a 12V rail, then have 0-10V range<br>
> 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.<br>
> <br>
> 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? <br>
> <br>
> Regards,<br>
> Spiros<br>
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