Misc. Circuits: Push-Pull Coil or Motor Driver Using 741 Op-Amp

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Here’s a circuit I found that allows a sensor input to control the direction of a motor or the polarity of an electromagnet coil on the output.
I found the circuit here:
http://www.depotbassam.com/2012/02/analog-dc-motor-driver-push-pull-power.html
Along with a great theory section including math for the mathematically inclined.

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