Hello!

Wondering if there is a pre-made circuit that will take 5v and kick on a small 5v fan when the temp gets at a certain point.

in my project, I only have 5v to work with so I cant use a 12v sensor.

I found this, https://www.ebay.com/itm/DC-5V-W120...e-Control-Switch-with-Sensor-IL-/273739237814

But I would like this circuit to be as small as possible. And I dont think I need it to be so advanced and.. I might want to try and build it myself if possible.

 

(( https://www.analog.com/media/en/technical-documentation/application-notes/an137f.pdf ))
or perhaps less experimenting http://www.ti.com/lit/ds/symlink/lm135.pdf
or https://www.st.com/resource/en/datasheet/stlm20.pdf
or https://www.electro-tech-online.com...sing-ic741-circuit-explaination-please.38663/