Op amp current source
A current source can be easily made with an Op Amp. A voltage is set at the non inverting (+) input. Then a resistor is connected from the inverting (-) input to the zero volt reference point (ground). Finally, the load is connected from the output to the inverting input. Current flows from the output through the load to the inverting input where a voltage is built up. That voltage builds up until it matches the + input. That voltage is also across the resistor going to ground. And so, the series load and current setting resistor, have the same amount of current flowing through them, which is the + input voltage/current setting resistor.
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741 op amp voltage to current circuit step by step build and demonstration Patrons can view the diagram at https://www.patreon.com/posts/30696409
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