The Howland Current Pump | Op-Amp Basics, episode 16

The Howland Current Pump Op-Amp Basics, episode 16 Please join me in supporting Heifer International: https://fundraise.heifer.org/fundrais... If Heifer's web site is blocked in your area, try https://www.heifer.nl/en/homepage-en/ Schametics available on the project GitHub: https://github.com/kennykb/kevins-cav... CircuitJS models for the demo circuit: https://is.gd/GT0udU In this episode we study the Howland current pump, a voltage-controlled current source that is capable of both sourcing and sinking currents, and has fully differential inputs. We examine the limitations that make it less popular than you might imagine. TIMELINE 00:00 Intro 01:26 Howland bio 03:03 PSA 04:20 How it works 07:06 Schematic 06:19 Test #1 08:19 What went wrong? 09:19 Test #2 12:08 Results 14:09 Howland limitations 15:17 Summary 16:20 Next steps 17:00 Bloopers CREDITS Images: "Bradford Howland" Courtesy of Cress Funeral and Cremation Service "Holos IntraOp" Courtesy of Clarity MSI Music: “Light Sting” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... “Apero Hour” Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/b... © 2026 Kevin B. Kenny