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Voltage Controlled Switch


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jrichard82 
Member - Posts: 2
Member spacespace
Joined: September 29, 2015
Location: California, United States
Posted: September 29, 2015 at 10:21 AM / IP Logged Link to Post Post Reply Quote jrichard82
The problem I'm trying to solve: I have a vehicle that has 3 wires for the tail/brake light. When the vehicle is on there is 12v+ between the red and black wires and there is 7v+ between the red and Orange wires. When you hit the brakes the 7v+ between the red and orange wires steps up to 10v+.
So I need to create a circuit that will turn on a set of LED lights when the voltage goes above 9 volts. Currently, my circuit consists of a voltage divider (changing 12v down to 9v), an LM324N OPAMP and an FQI50N06 MOSFET (Schematic shows IRF540). For some reason, on the OPAMP, when there is no input, the output is on, when the non-inverting input is higher than the inverting input the output is on and when the inverting input is higher than the non inverting input the output is off. So in my mind, this circuit is working, except when there is no input, the the output should be off. Please see the attached schematic:Voltage Controlled Switch - Last Post -- posted image.
tonanzith 
Gold - Posts: 593
Gold spaceThis member consistently provides reliable informationspace
Joined: July 18, 2008
Location: Washington, United States
Posted: October 10, 2015 at 10:17 PM / IP Logged Link to Post Post Reply Quote tonanzith
what vehicle?
Gary Sather
jrichard82 
Member - Posts: 2
Member spacespace
Joined: September 29, 2015
Location: California, United States
Posted: October 12, 2015 at 8:31 AM / IP Logged Link to Post Post Reply Quote jrichard82
The vehicle is a Polaris RZR. I actually just got the circuit working and will post the solution in this thread.

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