Patent ID: 6876184

Claim:
Circuit array for measuring a current consumption of a transistor-controlled load, in particular of an electric motor, comprising: one Output Bipolar Transistor (T 1 ) arrayed as a voltage follower, a Controlling Unit ( 13 ) for activating the base of said Output Bipolar Transistor (T 1 ), including (a) a Precision Resistor (RI) located in a branch parallel to a base-collector segment of said Output Bipolar Transistor (T 1 ), and (b) a measuring device which detects a voltage drop over said Precision Resistor (RI); wherein the load is an electronically commuted electric motor and said measuring device comprises an Evaluative Device ( 16 ) which evaluates impulses found in said voltage drop over said Precision Resistor (RI) for the purpose of determining the number of revolutions of said electric motor.