Op amp current sources take the current from the output, sends it through the load, and then the current is fed back to the inverting input (negative feedback) before sending it through a current setting resistor that goes to ground.

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I don’t have this book but it looks promising.

Video

Quick voltage follower using single supply op amp LM358 operational amplifier







Really easy to use USB multimeter tester used in a number of my videos.





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