[sdiy] keyboard question and generating cv

[Samppa Tolvanen]

On Mon, Apr 13, 2009 at 4:26 PM, Ian Smith <taciturn_unquiet at hotmail.com> wrote:

> Anywho, the next question in line would be, can a CV generating keyboard be run off of one (at most two if the supply needs to be bi-polar) 9V batteries. I really don't want any power wires running to this thing.

Basic "Don't trust the rails" approach should do. It's not going to be
any the state of art circuit, but assuming Your opamps are "ideal"
powering those off the rails is ok with voltage divider chain having
it's own zener regulation.

Samppa