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1  Using Arduino / General Electronics / CV detection - offsetting negative voltage, scaling? on: January 31, 2012, 06:03:51 pm

I'm trying to read the CV output of my Moog Etherwave Plus Theremin (pitch, volume & gate).
These are the specs:

• Pitch CV: Nominal output is -2.5V to + 4.5V.
• Volume CV: Nominal output is 0 to +10V.
• Gate Output : OFF is 0 Volts and +10V is ON.

For the volume and gate, voltage dividers should work (with two 1k resistors) to bring the signal to 5V, right?

The possible negative output of the pitch CV however scares me..

Cutting off the negative part with diodes should keep it safe, but it would be a shame to lose that part of the range...
Isn't there a nice way to shift (and compress) that to the trusty 0-5V range?

Thanks a lot!

[can't believe this is my first arduino forum post; have been using these beasts for quite a while now smiley-wink ]
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