[sdiy] CV --> microcontroller, how to limit input voltage?

[Paul Maddox]

John,

> I'd really be interested in seeing the transistor buffer you mention. I'm
in
> the same position of needing to limit some inputs (between 0V to 5V) so
I'd
> like to see some options like the one you mention.

sure, take a look here ;-
http://www.modulus.synth.net/projects/polymcv.pdf

Check out Q1,2,3,4 and 5
one point to bare in mind, I got the collector resistors wrong
(R17,18,20,23,25) , they should be 1K..
Another point, they become inverted, ie if you put a '1' on the port of the
micro you get 0v on the collector of the transistor, if you put a '0' on the
micro you get 15v on the collector of the tranmsistor..

Paul
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