An ultrasonic flow meter arranged to measure a flow rate of a fluid, the ultrasonic flow meter comprising: - at least two ultrasonic transducers (P1, P2) arranged for transmission and receipt of ultrasonic signals in opposite directions across a measuring distance, the at least two ultrasonic transducers comprising at least a first transducer positioned at one end of the measuring distance and at least a second ultrasonic transducer positioned at the other end of the measuring distance; - transducer switching means electrically connected to the at least two ultrasonic transducers; - a generator circuit for controlled generation of electrical signals for transmission to the at least two ultrasonic transducers, the generator circuit comprising or being connected to a signal source; - a receiver circuit for receiving electrical signals from the at least two ultrasonic transducers, the receiver circuit being separate from the generator circuit, the receiver circuit further comprising a receiver output for connection to a detection means; wherein the transducer switching means are arranged for controlled functional connection of: - the first ultrasonic transducer to either the generator circuit or the receiver circuit, and - the second ultrasonic transducer to either the generator circuit or the receiver circuit; so that the first ultrasonic transducer is electrically connected to the generator circuit and the second ultrasonic transducer Is electrically connected to the receiver circuit, or vice versa, wherein an output impedance of the generator circuit as seen from the at least two ultrasonic transducers is substantially zero, and wherein an input impedance of the receiver circuit as seen from the at least two ultrasonic transducers is substantially zero, characterized in that the generator circuit comprises an operational amplifier with a first input (+) connected to the signal source, a second input and an output connected to the second input (-) via a feedback connection, and wherein the second input is further connected to the transducer switching means so that the second input is operationally connected to the at least two transducers via the switching means, and wherein the receiver circuit comprises an operational amplifier with a first input (+) connected to ground or to a reference potential, a second input (-) and an output connected to the second input via a feedback connection, and wherein the second input is further connected to the transducer switching means so that the second input is operationally connected to the at least two transducers via the switching means. - at least two ultrasonic transducers (P1, P2) arranged for transmission and receipt of ultrasonic signals in opposite directions across a measuring distance, the at least two ultrasonic transducers comprising at least a first transducer positioned at one end of the measuring distance and at least a second ultrasonic transducer positioned at the other end of the measuring distance; - transducer switching means electrically connected to the at least two ultrasonic transducers; - a generator circuit for controlled generation of electrical signals for transmission to the at least two ultrasonic transducers, the generator circuit comprising or being connected to a signal source; - a receiver circuit for receiving electrical signals from the at least two ultrasonic transducers, the receiver circuit being separate from the generator circuit, the receiver circuit further comprising a receiver output for connection to a detection means; - the first ultrasonic transducer to either the generator circuit or the receiver circuit, and - the second ultrasonic transducer to either the generator circuit or the receiver circuit;