Hi.
I've have a couple of automotive sender units, one for pressure, and one for temp. I'm want to setup a 'switch' action in addition to gauges to work with the existing tell tales on the car. Aside from a spot of soldering, I'm pretty unskilled with electronics.
After some reading, looks like I need to use a comparitor. I think the best one to use would be a lm339 That is based on there being two sender units I'd like to do this for ( and maybe another down the line ). One sender operates from 10-180 ohms, and the other is 23-287ohms.
After some playing around I've come up with this
My real concern is burning out the comparitor... I don't really know what I'm doing, and am not running large resistance the circuit, which I gather allows a bit of current. There will also be a gauge in parallel ( which apparently has 1Kohm effect ).
Am I heading down the right track? Sorry I don't have any proper electronics simulators etc.
I've have a couple of automotive sender units, one for pressure, and one for temp. I'm want to setup a 'switch' action in addition to gauges to work with the existing tell tales on the car. Aside from a spot of soldering, I'm pretty unskilled with electronics.
After some reading, looks like I need to use a comparitor. I think the best one to use would be a lm339 That is based on there being two sender units I'd like to do this for ( and maybe another down the line ). One sender operates from 10-180 ohms, and the other is 23-287ohms.
After some playing around I've come up with this
My real concern is burning out the comparitor... I don't really know what I'm doing, and am not running large resistance the circuit, which I gather allows a bit of current. There will also be a gauge in parallel ( which apparently has 1Kohm effect ).
Am I heading down the right track? Sorry I don't have any proper electronics simulators etc.