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Voltage Controlled Switch

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brighteyes

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Guys

Was wondering if someone could help me with a small project.

I'm after something that will allow me to control (open or close) an output based on an input voltage taken from a Gear Position sensor on a motorcycle (0v to 5v) i.e. neutal=0.5v, 1st=1.1v, 2nd=2v, 3rd=2.7v, 4th=3.5v, 5th=4.1v and 6th=4.7v)
Otherwards turn on when voltage is between 0V and 3V and off up to 5V.
(On for 1st, 2nd & 3rd and off on 4th, 5th and 6th)

I'm a bit rusty but something tells me I simply need a zener diode to allow a voltage connected to an operational amplifer?

Also, what if I wanted to switch the output on for 4th i.e. variable resistance?
 
Get an LM3914. It has a built-in opamp, voltage reference, and up to 10 comparitors, each of which will switch at different levels. Everything you want in one chip.
 
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