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Old 03-21-2011, 05:58 PM   #10 (permalink)
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Originally Posted by UFO View Post
Just clamp the input pins to the power rail with diodes.
Sounds safe. :/
Maybe if you use high value resistors for your divider. Low values might pass enough current to out-feed the power regulator. If the regulator can basically run backwards, that might not be a problem. If it can't, you'll end up with greater than 5V as VCC.
Also, the forward bias voltage of the diode would mean the input hits 5.7 volts (or so, depending on the diode) before it starts clamping down.
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