4QD-TEC: Electronics Circuits Reference Archive Current Loop Interface

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This circuit was developed to interface one of the new type contactless (inductive) throttle sensors to
4QD's motor controllers for use in a conversion to an Eze-Go golf car.

The throttle itself consists of a coil and some electronics with a steel jacketed brass slug which is moved
in and out of the coil by the throttle movement. The assembly has only two contacts and draws a current
of between 600 microamps and 2 milliamps: the current varies with slug position as the throttle is
moved. As such it is a system which borrows much from the industrial 4-20mA current loop sensor
standard.