Current sensor

Submitted: Wednesday, Mar 08, 2017 at 12:40
ThreadID: 134435 Views:4329 Replies:7 FollowUps:17
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Hi again guys,

I need to install a fan to help with ventilation to my fridge in my ute tub.

Looking at using an Ua 741 op amp with a couple of thermisters to sence when the fridge compartment is above the temp of its surrounds, easy enough.

But then i thought to maybe use the voltage drop across the fuse as the input of the op amp so the fans only turn on when the compressor in the fridge is running.

Question is this, how little a difference across the + and - inputs is required to force the output to change states ?
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