I need a simple circuit, one or two components at most, that will only allow a certain range of voltage to pass. I.e. If a voltage is below a min, I do not want it to pass. If it is above a max, I also do not want it to pass.
I only want a voltage to pass if it is within a certain range, not below or above.
I have researched this using Zeners, Op-Amps, etc, and just have not been able to figure it out. The hard part has been having only a range between a min and a max.
Answer
"The Photon" actually pointed me in the right direction, a Window Comparator from here: how to build a circuit that compares two potentials?
and here: http://forum.allaboutcircuits.com/threads/window-detector-circuit.26663/
Both are over the two component limit that I wanted to stay within, but I can work with it.
I thank all for the great responses and good info.
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