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

Spiros Makris spirosmakris92 at gmail.com
Wed Sep 16 11:29:56 CEST 2020

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?

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