I am not absolutely sure about the ESP, but normally CMOS outputs have protection diodes which serve as freewheeling diodes for this small current. If you use the emitter followers you waste not less energy than with the resistor. And a transistor is typical 10 times more expensive than a resistor. The good people of Innovation Wireless have been nothing but a godsend to our school. As the school Technology Coordinator, I was given the task to find a school bell system for our charter school. The Sapling Company, Inc. • 670 Louis Drive Warminster, PA 18974 USA Phone: (+1) 215.322.6063 Fax: (+1) 215.322.8498 Web: www.sapling-inc.com Or wire the transistors as complementary emitter followers and do away with the 4 resistors. Emitter followers has a base-emitter drop, so for both paths that works out to drop 1.4V or so. Dakboard Digital Wall Display 32 inch, Smart Screen, Wifi Calendar, Smart Hub, Smart Home, Family Planner, Office Planner, large dashboard

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They could simply measure the voltage across the inductor or the driver transistor (inductive current) vs a preset threshold using a comparator/reference inside the chip. twig_render_template('themes/contrib/draft-theme/templates/content/node.html.twig', Array) (Line: 384)twig_render_template('themes/contrib/draft-theme/templates/field/field--entity-reference-revisions.html.twig', Array) (Line: 384) James Turrell-Inspired Light Box Artwork, Music Reactive, WiFi, Customizable Color, Handcrafted, DJ Party Light (Rectangle, Square)