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QUARKSPIN
11-10-2010, 09:37 PM
I'm building a drum memory system for my propeller, and before I go buy any opamps, I figured I'd check if I will need them. Does anyone know the smallest change in voltage that will make the propeller reliably regester a change?

Leon
11-10-2010, 09:51 PM
Data sheet page 26.

QUARKSPIN
11-10-2010, 09:52 PM
The prop has a datasheet? Wow... I'm going to go check that out now.

Ariba
11-10-2010, 11:17 PM
With such a circuit you should be able to detect changes of some millivolts:
http://forums.parallax.com/attachment.php?attachmentid=75148&stc=1&d=1289434645
You need to adjust the Poti slightly under the input threshold voltage.
This expects a DC coupled signal.

Andy