Can the LM341 5.0 be used for a temperature switch setup as shown? It seems to be working but the datasheet says minimum voltage it needs is 7.5V.

I am supplying it an input so that the output is within 5V (as required by my DAQ card). The DAQ card itself has a 5V supply. So using that, I am basically supplying a 5V input to obtain a 5V output reg. Please let me know if I am clear with my question.

Thanks!

V

 

Do not believe it is possible to have a 5V regulated output from a 5V input. Is not your 5V supply already regulated? It would be possible to boost the input and then regulate the output. Some boost ckts also supply regulation.

 

Thanks! All I want is the temperature switch to give an output 0V when temperature >50 deg C , otherwise give whatever input is supplied as output. So you think I can just use the series circuit without the LM341 and supply that as output to my DAQ?

V

 

how about this? My output should be within 5V because anything more than that would burn my card.

V

 

never mind!! I think I figured it out. And it is working

 

Care to share what you did to solve the problem?

 

Sure.... My need was to have an output of <5V because that is important for the device that reads it. So, I am not using the regulator but just using the second circuit that I showed. It is pretty simple and requires the non use of a regulator. My supply is USB powered and regulated.

V

 

That's not so good, because when the switch opens, your input is floating.

It should always have a path to ground; otherwise you may have odd results.

ADC's also need a low impedance source for measuring voltage.

This circuit addresses those concerns: