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Old 11-11-2011, 12:49 PM   #3 (permalink)
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You should be able to make a circuit using a voltage comparator like an LM211 or LM311 to do what you want.

For reference, you can look up autospeed's closed loop monitor circuit. I believe they use a similar circuit to power that. It would work essentially the same.
Current project: A better alternator delete
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